CHEM
Chapter 3

# Chapter 3 - Chapter 3 Stoichiometry Ratios of Combination...

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Chapter 3 Stoichiometry: Ratios of Combination Chapter 3 Stoichiometry: Ratios of Combination 1. What is the name given to the quantitative relationship between the substances that are consumed and produced in a chemical reaction? A) Law of Definite Proportions D) stoichiometry B) Law of Molecular Balance E) percent equivalency C) percent composition Ans: D Bloom's Taxonomy: 1 Difficulty: easy 2. Calcium fluoride, CaF 2 , is a source of fluorine and is used to fluoridate drinking water. Calculate its formula mass. 3. Calculate the molecular mass of tetraphosphorus decaoxide, P 4 O 10 , a corrosive substance which can be used as a drying agent. 4. Calculate the molecular or formula mass of rubidium carbonate, Rb 2 CO 3 . 5. Calculate the molecular or formula mass of (NH 4 ) 3 AsO 4 . A) 417.80 amu D) 156.96 amu B) 193.03 amu E) 108.96 amu C) 165.02 amu Ans: B Bloom's Taxonomy: 3 Difficulty: easy 6. Aluminum sulfate, Al 2 (SO 4 ) 3 , is used in tanning leather, purifying water, and manufacture of antiperspirants. Calculate its molecular or formula mass. A) 450.06 amu D) 278.02 amu B) 342.15 amu E) 74.98 amu C) 315.15 amu Ans: B Bloom's Taxonomy: 3 Difficulty: easy 7. Calculate the molar mass of Ca(BO 2 ) 2 ·6H 2 O. Page 31

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Chapter 3 Stoichiometry: Ratios of Combination 8. Calculate the molecular mass of potassium permanganate, KMnO 4 . 9. Calculate the molecular mass of menthol, C 10 H 20 O. 10. What is the molecular mass of acetaminophen, C 8 H 9 NO 2 ? A) 43 amu B) 76 amu C) 151 amu D) 162 amu E) 125 amu Ans: C Bloom's Taxonomy: 3 Difficulty: easy 11. What is the molar mass of nicotine, C 10 H 14 N 2 ? 12. Household sugar, sucrose, has the molecular formula C 12 H 22 O 11 . What is the % of carbon in sucrose, by mass? 13. What is the percent carbon in CH 3 CH 2 OH?
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