An analysis of compound C shows that this compound contains hydrogen, sulphur and oxygen. Determine the compound's empirical formula. What was his percentage of marks? The percent composition of a compound was found to be 63.5 % silver, 8.2 % nitrogen, and 28.3 % oxygen. 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 “percent” over the percent, a “P” over the part, and a “B” over the base. 47. Robyn paid £11 and Rachel paid £9. What is the % composition by weight 1. 10. A pupil scores 6 out of 10 in a test. Find his percentage of saving. Changing this fraction to a percentage, 6 10 6 10 =× =100 60%%. The molar mass for question #9 was determined by experiment to be 60.0 g/mol. A compound of lead has the following percentage composition: Pb = 90.66%, O = 9.34%. Harish saves ` 900 out of a total monthly salary of ` 14400. Ans: a. Answer the following questions: 9. What percentage of the total cost did each girl pay? 11. 8. Ans: b. What is the molecular formula? A candidate got 47500 votes in … (Pb =207,O=16 ) Asked … Question: What is the solubility limit at 20°C? 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. 46. I $15 CX2Ô3 2. Answer: 65 wt% 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% Percentage Practice To find the percent of a number, change the percent to a decimal and multiply. compound based on the percent composition by mass of each element in a compound. 7. Calculate the empirical formula of the compound. Express this as a percentage. Solution 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 What percent of her answers were correct? (Answer key begins on … 3. What is the % composition by weight of each element for CO 2? Percentage Questions is an an essential part for Competitive Exams like Banking, Insurance, SSC and Railways Exams. Determine this compound's empirical fomula. 4.2.2 Determine the percentage purity of the sample of sulphur (6) 4.3. An oxide of chromium is found to have the following % composition: 68.4 % Cr and 31.6 % O. The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. Solution '6 out of 10' can be written as 6 10. Determine the empirical formula of acetic acid. Stoichiometry Percent Composition So the percentage of carbon and hydrogen in ethane (C 2H 6. If Co < 65 wt% sugar: syrup If Co > 65 wt% sugar: syrup + sugar. Example: What is 30% of 50? Worked Example 3 Robyn and Rachel bought a set of CDs for £20. Prakhar obtained 18 marks in a test of total 20 marks. 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) 73% C and 27% O •B) 50% C and 50% O •C) 33% C and 67% O •D) 27% C and 73% O . - Try Now 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 . (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. 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