What percentage of the total cost did each girl pay? 47. compound based on the percent composition by mass of each element in a compound. Determine the empirical formula of acetic acid. Stoichiometry Percent Composition So the percentage of carbon and hydrogen in ethane (C 2H An analysis of compound C shows that this compound contains hydrogen, sulphur and oxygen. Solution Answer the following questions: 9. (Pb =207,O=16 ) Asked â¦ The molar mass for question #9 was determined by experiment to be 60.0 g/mol. Percent Composition Worksheet - Solutions Find the percent compositions of all of the elements in the following compounds: 1) CuBr 2 Copper (II) Bromide Cu: 28.45% Br: 71.55% 2) NaOH Sodium Hydroxide Na: 57.48% O: 39.99% H: 2.53% 3) (NH 4)2S Ammonium Sulfide N: 41.1% H: 11.8% S: 47.1% 4) N2S2 Dinitrogen disulfide N: 30.4% S: 69.6% 5) KMnO 4 Potassium permanganate The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. Answer: 65 wt% sugar . Determine this compound's empirical fomula. 11. Prakhar obtained 18 marks in a test of total 20 marks. What is the % composition by weight Worked Example 3 Robyn and Rachel bought a set of CDs for £20. Changing this fraction to a percentage, 6 10 6 10 =× =100 60%%. 3. 6. 4.2.2 Determine the percentage purity of the sample of sulphur (6) 4.3. What is the % composition by weight of each element for CO 2? â¢A) 73% C and 27% O â¢B) 50% C and 50% O â¢C) 33% C and 67% O â¢D) 27% C and 73% O . 10. 8. Percentage Practice To find the percent of a number, change the percent to a decimal and multiply. Example: What is 30% of 50? Harish saves ` 900 out of a total monthly salary of ` 14400. 1. What was his percentage of marks? Find his percentage of saving. 46. Solution '6 out of 10' can be written as 6 10. Percent Composition One can find the percentage of the mass of a compound that comes from each of the elements in the compound by using this equation: % element = (number of atoms)(atomic weight) (FW of the compound) x 100 . If Co < 65 wt% sugar: syrup If Co > 65 wt% sugar: syrup + sugar. Compound C has a molecular mass of 178 g.mol-1 and the following percentage composition: Hydrogen: 1,12% Sulphur: 35,96% Oxygen: 62,92% A candidate got 47500 votes in â¦ Convert the percentage to a decimal by moving the decimal point two places to the left and remove the percent sign: 30% = .30 You then multiply .30 X 50 to find the percent: .30 X 50 = 15 15 is 30% of 50. I \$15 CX2Ô3 2. Question: What is the solubility limit at 20°C? Determine the compound's empirical formula. 7. Ans: b. What is the molecular formula? (b) a very high percentage of graphite (c) a low percentage of graphite (d) graphite as its basic constituent of composition (e) none of the above is true. Calculate the empirical formula of the compound. Ans: a. Percentage Questions is an an essential part for Competitive Exams like Banking, Insurance, SSC and Railways Exams. Cast iron has (a) high tensile strength (b) its elastic limit close to the ultimate breaking strength (c) high ductility (d) all of the above (e) none of the above. A compound of lead has the following percentage composition: Pb = 90.66%, O = 9.34%. A pupil scores 6 out of 10 in a test. What percent of her answers were correct? An oxide of chromium is found to have the following % composition: 68.4 % Cr and 31.6 % O. Robyn paid £11 and Rachel paid £9. 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