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