# percentage composition questions and answers pdf

47. Express this as a percentage. compound based on the percent composition by mass of each element in a compound. (Pb =207,O=16 ) Asked â¦ What was his percentage of marks? 10. 1. (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. Harish saves ` 900 out of a total monthly salary of ` 14400. Worked Example 3 Robyn and Rachel bought a set of CDs for £20. 6. Percentage Questions is an an essential part for Competitive Exams like Banking, Insurance, SSC and Railways Exams. A compound of lead has the following percentage composition: Pb = 90.66%, O = 9.34%. I $15 CX2Ô3 2. 7. A candidate got 47500 votes in â¦ The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. An oxide of chromium is found to have the following % composition: 68.4 % Cr and 31.6 % O. Percentage Practice To find the percent of a number, change the percent to a decimal and multiply. Answer: 65 wt% sugar . Ans: b. 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 Solution What percentage of the total cost did each girl pay? - Try Now What is the molecular formula? 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 . 11. 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. Prakhar obtained 18 marks in a test of total 20 marks. 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% Determine the compound's empirical formula. Determine this compound's empirical fomula. Ans: a. The percent composition of a compound was found to be 63.5 % silver, 8.2 % nitrogen, and 28.3 % oxygen. If Co < 65 wt% sugar: syrup If Co > 65 wt% sugar: syrup + sugar. A pupil scores 6 out of 10 in a test. 46. What is the % composition by weight Solution '6 out of 10' can be written as 6 10. Example: What is 30% of 50? Stoichiometry Percent Composition So the percentage of carbon and hydrogen in ethane (C 2H (Answer key begins on â¦ What is the % composition by weight of each element for CO 2? Calculate the empirical formula of the compound. 4.2.2 Determine the percentage purity of the sample of sulphur (6) 4.3. 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 . An analysis of compound C shows that this compound contains hydrogen, sulphur and oxygen. Question: What is the solubility limit at 20°C? Changing this fraction to a percentage, 6 10 6 10 =× =100 60%%. 8. 3. What percent of her answers were correct? Robyn paid £11 and Rachel paid £9. Answer the following questions: 9. 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. The molar mass for question #9 was determined by experiment to be 60.0 g/mol. Percent Packet Created @ 2009 MLC page 3 of 20 P percent B Exercise 1 (answers on page 16) Directions: Identify the percent, part, and base in each of the following problems by writing âpercentâ over the percent, a âPâ over the part, and a âBâ over the base. Determine the empirical formula of acetic acid. 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