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Stoichiometry and the Mole Practice Questions

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Updated on Sep 24, 2011

Review the following concept if needed -  Stoichiometry and the Mole Study Guide

Practice Questions

Calculate the following:

1. molar mass of nitrogen trioxide

2. molar mass of acetic acid, CH3CO2H

3. number of moles of nitrogen trioxide in 67.8 g

4. number of grams in 2.5 moles of acetic acid

5. number of molecules in 36.2 g of acetic acid

Calculate the mass percent for each element in each of the following compounds.

6. phosphoric acid, H3PO4

7. ethyl alcohol, C2H5OH

8. acetone, C3H6O

9. iron (III) oxide

Determine the formula for each of the following compositions

0. 92.26% carbon, 7.74% hydrogen

11. 0.8408 g nitrogen, 0.1208 g hydrogen, 0.360 g carbon, 0.480 g oxygen

12. 5.045 g carbon, 1.693 g hydrogen, 6.72 g oxygen

13. 38.44% carbon, 4.84% hydrogen, 56.72% chlorine

Answers

1. 62.01 g/mol

2. 60.05 g/mol

3. 1.09 moles

4. 150 g

5. 3.63 * 1023 molecules

6. 3.086% H, 31.61% P, 65.31% O

7. 52.14% C, 13.13% H, 34.73% O

8. 62.04% C, 10.41% H, 27.55% O

9. 69.94% Fe, 30.06% O

10. CH

11. N2H4CO

12. CH4O

13. C2H3Cl

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