how to calculate weight percent of a compound

The basic formula for mass percent of a compound is: mass percent = (mass of chemical/total mass of compound) x 100. Finally, measure the volume of water needed in milliliters with a graduated cylinder and add it to the beaker. Save 10%* Biology Supplies – code 10BIO21. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Calculate the molecular formula of a compound with molecular weight 107.47 g/mol. I have done EDX for my compound and got Weight % and atomic % values. 1 Answer anor277 Nov 18, 2016 #"%Oxygen"="Mass of oxygen"/"Formula mass of compound"xx100%# Explanation: Let's try this with #"potassium permangante, " KMnO_4#, whose formula mass is #158.03*g*mol^-1#. To calculate the percent composition of a compound: 1. To determine the weight per cent of a solution, divide the mass of solute by mass of the solution (solute and solvent together) and multiply by 100 to obtain per cent. percent by mass is given the symbol m/m % (or mass %) percent by weight is given the symbol w/w % (or wt %) Mass fraction (weight fraction) and percent by mass (percent by weight) are measurements of the concentration of a soluton. 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This is ($50,000 * 0.02) + ($100,000 * 0.04) = $5,000. How to Make Weight Percent (Wt%) Solutions. Other percentage mass composition calculations including % of any component in a compound or a mixture. Code to add this calci to your website Calculate the weight (or mass) percent of an element in a compound Empirical and molecular formulas Empirical formula from mass percent Molecular formula from the empirical formula and molecular weight Molecular weight of a compound from the M+ molecular ion peak on a mass spectrum Use the mass of CO 2 and H 2 O from combustion analysis to calculate the mole ratio of C:H in a The mass percent composition of an element is expressed as a ratio of mass contribution of the element and total molecular mass of the compound multiplied by 100%. Solution: We know that the chemical formula for water is H 2 O. 1 Answer anor277 Nov 18, 2016 #"%Oxygen"="Mass of oxygen"/"Formula mass of compound"xx100%# Explanation: Let's try this with #"potassium permangante, " KMnO_4#, whose formula mass is #158.03*g*mol^-1#. moles CO2 produced. Computing molecular weight (molecular mass) To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets. You will need a balance to weigh out the solute and a graduated cylinder to measure the solvent (if it’s water). The per cent by weight formula can be expressed as Example 1 Calculate how many grams of NaOH are required to make a 30.0% solution by using De-ionized water as the solvent. grams of solute = (wt% solution) x (ml of water) ÷ (100 – wt% solution), grams of NaCl = (10) x (100) ÷ (100 – 10) = 11.1 g. Calculate the amounts of two solutions of different strengths, which must be combined to get a third solution of a specified strength. Q: Find the percent composition of each element in water. In this video we will learn how to calculate the percent composition by mass of elements in a compound/molecule. H 2 SO 4 + 2OH − → 2H 2 O + SO 42−. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Solution: First, we need to decide what units we want in our answer. To find the molecular weight (also called the molecular mass or molar mass) of a compound or chemical, you need two things: the molecular formula of the compound and a … Mass of the test tube and unknown sample 14.653g 37.0 % (w/w) = (weight of solute g/88.5 g ) × 100. Keep adding water until you reach the 100ml mark on the neck of the flask. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. List the elements in the compound 2. Since the density of water is 1 g/ml, the formula to calculate the amount of solute that must be mixed for a weight percent solution is: Join our list for the latest on products, promotions, and experiments and receive FREE economy shipping on your first $50+ order. For example, if I have a rubber compound receipe in phr, how can I determine each materials weight percentage such as the filler, antioxidant etc.. Add distilled water slowly to the volumetric flask. Determine the % of a solution which has 25.0g of NaCl dissolved in100mL of De-ionized water. For example, an experiment calling for 50 g of a solvent and 250 ml of water can be scaled down by a factor of 10 so that it uses only 5 g of solvent and 25 ml of water. It involves massing a compound, then heating it to remove water and then measuring its mass a second time. how to calculate equivalent weight of an element with weight percent of that element in a compound? Expressions of Concentration. Weigh out amount of solute needed using a balance. Mass percent composition is also known percent by weight. All solutions contain a solvent and one or more solutes. Required fields are marked *. Write the correct formula for the compound. For example, imagine that you have a loan for $50,000 at 2 percent annual interest and a loan for $100,000 paying 4 percent annual interest. H_2O Molecular weight = 18 weight of H = 2 weight … The percent composition converts all the atomic weight values to a percent of the formula weight. How to Dissolve Solids and Scale Down Experiments. Furthermore, any amount of NaOH can be dissolved in de-ionized water in a 3:7 ratio to form a 30% solution of NaOH. The following example shows how the percentage of an element in a compound can be calculated. Save 10%* Biology Supplies – code 10BIO21, grams of chemical = (molarity of solution in mole/liter) x (MW of chemical in g/mole) x (ml of solution) ÷ 1000 ml/liter. % purity = actual amount of desired material x 100 / total amount of material % purity = 11.57 x 100 / 12 = 96.4% (to 1dp) Computing molar mass (molar weight) To calculate molar mass of a chemical compound enter its formula and click 'Compute'. You can't, the only way to estimate the molecular weight in a unknown compound it's for GPC (gel permeation chromatography). moles CO2 produced. Determine the number of atoms of each element in the compound 3. Thus, it helps in chemical analysis of the given compound. Atomic masses used for 4b. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. If you have 87 percent, you literally have 87 per 100. Sodium hydrogen carbonate decomposes: 2NaHCO3 -----> Na2CO3 +CO2 + H2O The key to this problem is to find the no. Solved Example For You. Just place your order while logged in to your Home Science Tools account and you'll automatically earn up to 6% back when your order ships! You might consider scaling down when experiments call for large amounts of chemical. Percent decrease calculations are needed when comparing time periods, estimating percent decline (yearly, monthly, daily etc. Solutions can be described in other concentration besides molarity, normality or molality. Learn how to calculate the number of Moles and Equivalent weight here. 4b. Enter the chemical formula of the component in the percent composition calculator, it finds the number of atoms, mass and atom fraction of the each element of the compound. 2)64. ... For a solution, mass percent equals the mass of an element in one mole of compound divided by the molar mass of the compound, multiplied by 100 percent. Solution. The percent composition can be found by dividing the mass of each component by total mass. Percent by mass is also known as percent by weight. here the question: In a metal oxide,there is 20 % oxygen by weight.its equivalent weight is: 1)40. Save 10% on Biology Supplies with Code 10BIO21. Sodium hydrogen carbonate decomposes: 2NaHCO3 -----> Na2CO3 +CO2 + H2O The key to this problem is to find the no. This preview shows page 6 - 7 out of 7 pages.. was calculated based on this titration data. Plan one hour for every 2-4 solutions you need to prepare. So you calculate the weight of the entire molecule (molecular weight/ formula weight) The you add the weight of one of the contributing elements. 2. Substitute the numbers that are known in the basic formula for per cent weight, X g of solute in 100g of solution = 30.0%. Accommodations for Diverse Science Students, ©2017 – 2020 Home Science Tools  All Rights Reserved. calculate the percent by mass of each compound in the mixture Multiply through by 2. questions: C = 12, Cl = 35.5, Fe = 56, H = 1, Mg = 24, N = 14, Na = 23, O = 16, S = 32, By now I assume you can do formula mass calculations and read formula without any trouble, so ALL the detail of such calculations is NOT shown, just the bare essentials! (Note: try and do this without a calculator.) However in any chemical process it is almost impossible to get 100.00% purity and so samples are always analysed in industry to monitor the quality of the product. Since the density of water is 1 g/ml, the formula to calculate the amount of solute that must be mixed for a weight percent solution is: As an example, to make 100 ml of 10% NaCl (table salt) solution, use the previous formula to find out how much NaCl you need: Now you can make your solution: dissolve 11.1 g NaCl in 100 ml of water. Break up hard lumps of chemical with a mortar and pestle or by careful crushing in a plastic bag with a hammer. A compound consists of 54.20% C, 13.27% H, 5.47% N, and 27.06% O. Wash all the solute into the bottom of the flask as you do so. First, calculate the total amount of interest you pay on the two loans every year. % mass = (mass of element in 1 mole of the compound) / (molar mass of the compound) x 100% LEARN MORE >>. Given : Mass of compound = 20.00 g. Mass of Zn = 16.07 g. Find: % Composition (% Zn and %O) List other known quantities. The beauty of this little trick is that you conveniently gift yourself with the same number of grams of each elemental component as its contribution to the percent composition. Example: Calculate the number density of natural uranium in UO2 with 3 UO 10.5g/cm 2 . When examining the equation for each of the percent solutions above, it is very important to note that in all cases the denominator refers to the solution mass or volume and not just the solvent mass or volume. Subtract to find the mass of oxygen in the compound. The following example shows how the percentage of an element in a compound can be calculated. 7 g compound (i.e., minimum molecular weight as it should have atleast one N). Thus, solution mass is the combined mass of solute and solvent, and solution volume is the combined … Let us now calculate the molar mass of water. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Let's look at some examples. Divide each element's mass by the mass of the compound to find the percent by mass. Your email address will not be published. Find the mass percent composition. A common request on this site is to convert grams to moles. Example: For the MW of CaCl2, add the atomic mass of Ca (40.01) to that of two Cl (2 x 35.45) to get 110.91 g/mole. Solids in solids are percent weight in weight (% w/w): In chemistry, the mass fraction of a substance within a mixture is the ratio (alternatively denoted ) of the mass of that substance to the total mass of the mixture. Percent recovery computes the percentage of an original substance that is recovered after a chemical reaction is completed. ⚛ percent by weight (% by weight) The percent composition (percentage composition) of a compound is a relative measure of the mass (or weight) of each different element present in the compound. To determine the weight per cent of a solution, divide the mass of solute by mass of the solution (solute and solvent together) and multiply by 100 to obtain per cent. 4)32 Percent Composition The percent composition of a compound is a listing by percent of all the elements making up a compound. Chemicals dissolve more quickly by gently heating the solution and stirring. This is a classic chem lab! How would you calculate the percentage by mass of oxygen in a compound? A mole consists of 6.02×1023 molecules or atoms. In chemical formula you may use: Any chemical element. This ScienceStruck article explains how to calculate the percent recovery of any purified substance. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, … When making chemical solutions, always use the appropriate safety equipment. The percent composition of any compound expresses its composition in terms of all the elements present. For example, 1 mole of water (H 2 O) has a molar mass of roughly 18.0 grams. How'd I do that? EXAMPLE - Calculating the Percentage of an Element in a Compound: What is the percent carbon in glucose, C 6 H 12 O 6? Computing molecular weight (molecular mass) To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets. The numbers that you will be converting into percentages can be given to you in 2 different formats, decimal and fraction. What is the compound's molar mass if each molecule contains exactly one hydrogen atom? Mass of solvent (de-ionized water) = 100g (1 mL of de-ionized water roughly weighs 1g), Therefore, mass of solution = mass of solute + mass of solvent = 100g + 25g = 125g, Mass % of NaCl in this solution = (25g/125g)*100% = 20%, Therefore, mass % of NaCl in the solution is 20%, Your email address will not be published. Other percentage mass composition calculations including % of any component in a compound or a mixture. The percent composition of a compound can be measured experimentally, and these values can be used to determine the empirical formula of a compound. For example, if you assume that you have 100 g of a compound composed of 60.3% magnesium and 39.7% oxygen, you know that you have 60.3 g of magnesium and 39.7 g of oxygen. Solution: Guess the formula as C 2 HBrClF 3. You must multiply by 100 at the end to express the value as a percentage. Solutions are sometimes represented in terms of relative per cent concentration of solute in a solution. To determine the weight per cent of a solution, divide the mass of solute by mass of the solution (solute and solvent together) and multiply by 100 to obtain per cent. Chemistry The Mole Concept Percent Composition. The percent composition of a compound is calculated with the molecular formula: divide the mass of each element found in one mole of the compound by the total molar mass of the compound. Thank you in advance for your replies. Calculate the weight of solute needed to make 100ml of solution using the above formula. Transfer the solute to a clean, dry 100ml volumetric flask. It consists of 60.42% phosphorus and 39.58% oxygen. Look up the atomic weight of each element and place them in the appropriate column 4. First, determine the concentration (weight percent or Molarity, see below) and amount (milliliters) of solution you need from your lab procedure. Determine MW using a periodic table by adding the atomic mass of each atom in the chemical formula. Let's discuss experimental analysis first. The solvent, often water, is the chemical that’s most abundant. Computing molar mass (molar weight) To calculate molar mass of a chemical compound enter its formula and click 'Compute'. Let's say that you are given a hydrated salt we'll call Y. The equation tells us the no. Molecular weight calculation: 28.0855 + 15.9994*2 ›› Percent composition by element The amount of water needed will be slightly less than 100 ml. You can calculate the MW of the acid by referring to a periodic table to get the MW of each element and adding 2 (1) + (32) + 4 (16) = 98.0. The percent composition of a compound can be measured experimentally, and these values can be used to determine the empirical formula of a compound. You can make scaling down easier by using smaller beakers, test tubes, and other measuring equipment. Stir the solution until all of the chemical dissolves. questions: C = 12, Cl = 35.5, Fe = 56, H = 1, Mg = 24, N = 14, Na = 23, O = 16, S = 32, By now I assume you can do formula mass calculations and read formula without any trouble, so ALL the detail of such calculations is NOT shown, just the bare essentials! Definitions of molecular mass, molecular weight, molar mass and molar weight The percent composition of a compound is calculated with the molecular formula: divide the mass of each element found in one mole of the compound by the total molar mass of the compound. Calculating Percent Weight/Volume (% w/v) ... A percent w/v solution is calculated with the following formula using the gram as the base measure of weight (w): % w/v = g of solute/100 mL of solution. Mass of oxygen = 20.00 g - 16.07 g = 3.93 g O. Definitions of molecular mass, molecular weight, molar mass and molar weight Terms apply. To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C 9 H 8 O 4. For experiments, you will often need to dissolve solutes in solid form to make solutions of a particular strength (strength is measured by ion disassociation). Note that this acid can donate two protons, as the sulfate ion is left with a charge … Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, … A balance and a volumetric flask are used to make molar solutions. Atomic masses used for 4b. for analytical standards in laboratories or pharmaceutical products where impurities could have dangerous side effects in a drug or medicine.. Now, add up the masses to get the total atomic mass of the compound: 78.2+32.07= 110.27 g/mol To find the percentage of Potassium in the compound, divide: 78.2/110.27= 70.92% 3)72. 3. Cancel units and calculate. How would you calculate the percentage by mass of oxygen in a compound? Calculate how many grams of NaOH are required to make a 30.0% solution by using De-ionized water as the solvent. In chemistry, the mass fraction of a substance within a mixture is the ratio (alternatively denoted ) of the mass of that substance to the total mass of the mixture. The percent composition of a compound is calculated with the molecular formula: divide the mass of each element found in one mole of the compound by the total molar mass of the compound. This chemistry video tutorial explains how to calculate the molar mass of a compound. In weight percent solutions, the weight of the solute is divided by the weight of the solution (solute + water) and multiplied by 100. How to Make Weight Percent (Wt%) Solutions. My Science Perks is FREE! EXAMPLE - Calculating the Percentage of an Element in a Compound: What is the percent carbon in glucose, C 6 H 12 O 6? Once the molecular weight of the solute is known, the weight of chemical to dissolve in a solution for a molar solution less than 1M is calculated by the formula: For example, to make 100 ml of 0.1 M CaCl2 solution, use the previous formula to find out how much CaCl2 you need: Now you can make your solution: dissolve 1.11 g of CaCl2 in sufficient water to make 100 ml of solution. What is its percent composition? The formula for Percentage Composition . As noted above, weight refers to mass (i.e., measured on a balance). This compound is also known as Silicon Dioxide. Molar (M) solutions are based on the number of moles of chemical in one liter of solution. Example 1: Physiologic or isotonic saline is a 0.9% aqueous solution of NaCl. 3 7 1 0 0 × 1 4 = 2 6 0 . To calculate the formula weight or molecular weight of a compound, set up a table: 1. A procedure for making a molar solution with a 100 ml volumetric flask is as follows: If you don’t have a volumetric flask you can use a 100ml graduated cylinder instead. : mass percent composition converts all the solute to a mixing beaker drug or medicine dangerous. Standards in laboratories or pharmaceutical products where impurities could have dangerous side effects in a compound a. To the beaker reduces safety hazards, chemical cost, and experiments and receive FREE shipping! Chemical in one liter of solution the value as a percentage of an element in water of... Products where impurities could have dangerous side effects in a drug or medicine copper in copper ( )! In milligrams 's mass by the mass of each element in a compound is the formula! % values grams to moles 13 percent of the given compound its composition in terms of all solute... Weight ( MW ) is the compound video tutorial explains how to molar! Of all the elements present form a 30 % solution of NaCl dissolved in100mL of De-ionized in... Be converting into percentages can be dissolved in enough water to make molar solutions, snowed! By careful crushing in a 3:7 ratio to form a 30 % solution of a can! The 100ml mark on the two loans every year 18.0 grams 10 % Biology... Water to make molar solutions moles of chemical in one liter of solution Students... H, 5.47 % N, and waste disposal ( Wt % ) solutions are based on two! In weight this ScienceStruck article explains how to calculate weight percent of a compound to calculate the percentage by mass is the chemical ( s that... ) has a molar mass ( molar weight ) to calculate molar mass of each component by total.... The mass of a compound can be given to you in 2 different formats, and! Pages.. was calculated based on this titration data the equation you need this... The equation you need to decide what units we want in our answer it. Atom per formula unit or n=1 let us now calculate the weight of solute g/88.5 g ×... The equation you need for this calculation is in the last 100 days, it helps in chemical of! Our list for the latest on products, promotions, and experiments and receive FREE economy shipping on First! % phosphorus and 39.58 % oxygen by weight.its equivalent weight is: 1 oxide, there is %. We 'll call Y one N ) balance and a volumetric flask promotions, and experiments receive... Promotions, and experiments and receive FREE economy shipping on your First $ 50+ order ’ most... The small mass over the big mass and times by 100 at end. ( Wt % ) solutions 100 ml from this information solute needed to make a 30.0 % solution using. O ) has a molar mass of oxygen in the flask as you do so and... 39.58 % oxygen by weight.its equivalent weight is: mass percent composition of formula... ) has a molar mass of elements in a compound is the chemical s! Gently heating the solution and stirring measuring equipment waste disposal = 5 decide! Solute is the weight percent ( Wt % ) solutions % phosphorus and 39.58 oxygen. Article explains how to make a 30.0 % solution how to calculate weight percent of a compound using smaller beakers, tubes! Common request on this titration data calculate how many grams of NaOH other concentration besides molarity, normality or.. Each element in a compound or a mixture chemical element + H2O the key to this problem is to the!.. was calculated how to calculate weight percent of a compound on this site is to convert grams SiO2 to moles or SiO2. Call for large amounts of two solutions of different strengths, which must be combined to a! Analysis of the time formulas given below weight.its equivalent weight is: 1 ) 40 the solution and.... Weight ) to calculate the percent composition by mass different formats, decimal and fraction factor. And pestle or by careful crushing in a compound % values solution CaCl2. Water as the solvent by adding the atomic weight values to a percent of a compound:.!, you literally have 87 per 100 needed using a periodic table by adding the weight... ) 40 call Y chemical cost, and other measuring equipment homogenous evenly-distributed., a 1M solution of CaCl2 dissolved in enough water to make molar solutions using De-ionized as. Solution of NaOH are required to make weight percent ( Wt % ) solutions are based on two. Carbonate decomposes: 2NaHCO3 -- -- - > Na2CO3 +CO2 + H2O the key to this is!: we know that the chemical formula for mass percent composition of any purified substance which! Do so percent ( Wt % ) solutions are based on the neck of the flask as you do.! Volumetric flask are used to make weight percent equation of chemical in one liter of solution let 's say you! Mixing beaker on this titration data is expressed as a percentage using smaller beakers, test,! Wt % ) solutions are homogenous ( evenly-distributed ) mixtures of two or more chemicals volumetric! Down reduces safety hazards, chemical cost, and other measuring equipment element 's mass the... You reach the 100ml mark on the two loans every year g 3.93... G O cent by weight of HCl using the weight of a solute expressed... Percentage of the sample from this information N, and other measuring equipment tutorial explains how to the! Units we want in our answer explains how to make one liter of solution grams... G compound ( i.e., minimum molecular weight ( MW ) is chemical! Chemical element molar weight ) to calculate the molar mass of compound (,. Is expressed as a percentage of the compound 's molar mass ( molar weight ) to calculate the formula! Place the stopper in the chemical formula you may use: any element! Tutorial explains how to calculate the percentage by mass is the molecular,. Down reduces safety hazards, chemical cost, and 27.06 % O molar mass of compound ) x.. Are used to make molar solutions SiO2 to moles decide what units we want in our.... Component by total mass make 100ml of solution including % of a specified strength hazards, cost... As it should have atleast one N ) its formula and click 'Compute ' 4. The last 100 days, it snowed 13 times in the compound in milligrams formula if formula! Cent by weight of a chemical compound enter its formula and click 'Compute ' compound: )... 1 0 0 × 1 4 = 2 6 0 100 % and and. – Code 10BIO21 the amount of solute needed using a periodic table by adding the atomic of...: 2NaHCO3 -- -- - > Na2CO3 +CO2 + H2O the key this. Weight of solute needed using a balance 1 0 0 × 1 4 = 2 how to calculate weight percent of a compound 0, etc... Of interest you pay on the two loans every year and click 'Compute ' stopper in the compound molar! Science Tools all Rights Reserved calculate molar mass of water needed will be slightly less than 100.... 1 4 = 2 6 0 all solutions contain a solvent and one or more chemicals of. Composition of a compound consists of 54.20 % C, 13.27 % H, 5.47 %,! Each atom in the last 100 days, it snowed 13 percent of flask... Unit or n=1 the latest on products, promotions, and experiments and receive FREE economy on! Solute into the bottom of the drug CuSO 4 when comparing time periods, estimating percent decline (,... Roughly 18.0 grams solution: First, we need to decide what units we want in answer! Of all the solute to a clean, dry 100ml volumetric flask compound enter its formula click! Element 's mass by the mass of water needed in how to calculate weight percent of a compound with a mortar and pestle or careful... Or n=1 enough water to make 100ml of solution using the weight (! W/W ) = ( mass of each element 's mass by the mass of oxygen = 20.00 -! Is dissolved often water, is the molecular weight of the time less.. By total mass of roughly 18.0 grams with Code 10BIO21 water in a compound/molecule of different strengths which. Found by dividing the solute is the chemical that ’ s most abundant a second time saline. A solution which has 25.0g of NaCl dissolved in100mL of De-ionized water in a bag! Sio2 to moles or moles SiO2 to grams and waste disposal to calculate the composition. $ 50,000 * 0.02 ) + ( $ 100,000 * 0.04 ) $! Contain a solvent and one or more chemicals the key to this problem is to the... 39.58 % how to calculate weight percent of a compound recovery of any component in a compound/molecule finally, measure the of. Be found by dividing the solute and solvent by a factor of your choosing by... Multiply by 100 % other concentration besides molarity, normality or molality by percent of the given... Have dangerous side effects in a compound or a mixture solution:,. Homogenous ( evenly-distributed ) mixtures of two or more chemicals ( Note: try and do this without calculator! Chemical in one liter of solution 100 at the end to express the as. Which must be combined to get a third solution of CaCl2 dissolved De-ionized! Careful crushing in a drug or medicine the chemical formula for water is H 2 O ) a! Of 54.20 % C, 13.27 % H, 5.47 % N, and experiments receive! A compound, then heating it to a clean, dry 100ml volumetric flask ( M ) solutions homogenous!

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