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Percent Composition Problem Set: Chemistry Exercises for High School and University, Exams of Chemistry

University of California - BerkeleyChemistry

1) How many grams of oxygen can be produced from the decomposition of 100 g of KClO3? Molar mass. = 122.6 g/mol. % oxygen = 3(16.0) / 122.6 = 39.2% O.

Typology: Exams

2022/2023

Uploaded on 02/28/2023

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WLHS / Chem / Monson Name
Date Per
KEY - PERCENT COMPOSITION PROBLEM SET
Determine the percentage composition of each of the compounds below.
1) KMnO4 molar mass: 158.0 g/mol
% composition: K: 24.7% Mn: 34.7% O: 40.5%
2) HCl molar mass: 36.5 g/mol
% composition: H: 2.7% Cl: 97.3%
3) Mg(NO3)2 molar mass: 148.3 g/mol
% composition: Mg: 16.4% N: 18.9% O: 64.7%
4) (NH4)3PO4 molar mass: 149.0 g/mol
% composition: N: 28.2% H: 8.1% P: 20.8% O: 43.0%
5) Al2(SO4)3 molar mass: 342.3 g/mol
% composition: Al: 15.8% S: 28.1% O: 56.1%
6) sodium nitrite formula: NaNO2 molar mass: 69.0 /g/mol
% composition: Na: 33.3% N: 20.3% O: 46.4%
7) calcium chlorite formula: Ca(ClO2)2 molar mass: 175.1 /g/mol
% composition: Ca: 22.9% Cl: 40.5% O: 36.6%
8) dinitrogen pentoxide formula: N2O5 molar mass: 108.0 /g/mol
% composition: N: 25.9% O: 74.1%
9) aluminum phosphite formula: AlPO3 molar mass: 106.0 /g/mol
% composition: Al: 25.5% P: 29.2% O: 45.3%
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WLHS / Chem / Monson Name Date Per KEY - PERCENT COMPOSITION PROBLEM SET Determine the percentage composition of each of the compounds below.

  1. KMnO 4 molar mass: 158.0 g/mol % composition: K: 24.7% Mn: 34.7% O: 40.5% 2 ) HCl molar mass: 36.5 g/mol % composition: H: 2.7% Cl: 97.3%
  2. Mg(NO 3 ) 2 molar mass: 148.3 g/mol % composition: Mg: 16.4% N: 18.9% O: 64.7%
  3. (NH 4 ) 3 PO 4 molar mass: 149.0 g/mol % composition: N: 28.2% H: 8.1% P: 20.8% O: 43.0%
  4. Al 2 (SO 4 ) 3 molar mass: 342.3 g/mol % composition: Al: 15.8% S: 28.1% O: 56.1%
  5. sodium nitrite formula: NaNO 2 molar mass: 69.0 /g/mol % composition: Na: 33.3% N: 20.3% O: 46.4%
  6. calcium chlorite formula: Ca(ClO 2 ) 2 molar mass: 175.1 /g/mol % composition: Ca: 22.9% Cl: 40.5% O: 36.6%
  7. dinitrogen pentoxide formula: N 2 O 5 molar mass: 108 .0 /g/mol % composition: N: 25.9% O: 74.1%
  8. aluminum phosphite formula: AlPO 3 molar mass: 106 .0 /g/mol % composition: Al: 25.5% P: 29.2% O: 45.3%
  1. carbonic acid formula: H 2 CO 3 molar mass: 62 .0 /g/mol % composition: H: 3.2% C: 19.4% O: 77.4% (over)
  1. Calculate the percent composition of each of the following compounds: A) acetone, CH 3 COCH 3 Molar mass = 58.0 g/mol %C = 62.1% C %H = 10.3% H %O = 27.6% O B) aspirin, CH 3 COOC 6 H 4 COOH Molar mass = 180.0 g/mol %C = 60.0% C %H = 4.4% H %O = 35.6% O
  2. Copper is obtained from ores containing the following minerals: Azurite, Cu 3 (CO 3 ) 2 (OH) 2 % Cu: 55.3% Chalcocite, Cu 2 S % Cu: 79.8% Chalcopyrite, CuFeS 2 % Cu: 34.6% Covelite, CuS % Cu: 66.4% Cuprite, Cu 2 O % Cu: 88.8% Malachite, Cu 2 CO 3 (OH) 2 % Cu: 57.5% Calculate the % of each mineral that consists of COPPER. Which mineral has the highest copper content on a percent-by-mass (percent composition) basis? Why might this information be important to a mine developer? *Highest % Cu is CUPRITE (88.8%). **A mine developer needs to know if there is enough Cu available in the ore to make it cost-efficient.