Stoichiometry and the Mole

Stoichiometry and the Mole - Unit 3: Stoichiometry and the...

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Unit 3: Stoichiometry and the Mole – 50 point quiz (MC = 2 points each, SA = 1 point each) 1. What is the percent by mass of oxygen in H 2 SO 4 ? a. 16% b. 33% c. 65% d. 98% 2. Given: 2CO(g) + O 2 (g) → 2CO 2 (g), what is the mole ratio of CO(g) to CO 2 (g) in this reaction? a. 1:1 b. 1:2 c. 2:1 d. 3:2 3. A compound has a molar mass of 90. grams per mole and the empirical formula is CH 2 O. What is the molecular formula of this compound? a. CH 2 O b. C 2 H 4 O 2 c. C 3 H 6 O 3 d. C 4 H 8 O 4 4. Which pair consists of a molecular formula and its corresponding empirical formula? a. C 2 H 2 and CH 3 CH 3 b. C 6 H 6 and C 2 H 2 c. P 4 O 10 and P 2 O 5 d. SO 2 and SO 3 5. Given: C 3 H 8 + 5O 2 → 3CO 2 + 4H 2 O, which ratio of oxygen to propane is correct? a. 5 grams O 2 / 1 gram C 3 H 8 b. 5 moles O 2 / 1 mole C 3 H 8 c. 10 g O 2 / 11 g C 3 H 8 d. 10 g O 2 / 11 moles C 3 H 8 6. The molar mass of Ba(OH) 2 is a. 154.3 g b. 155.3 g c. 171.3 g d. 308.6 g 7. The percent composition by mass of magnesium in MgBr 2 is equal to a. 100 x (24/184) b. 100 x (160/184) c. 100 x (184/24) d. 100 x (184/160) 8. Given: CaCO 3 (s) + 2HCl(aq) → CaCl 2 (aq) + H 2 O(l) + CO 2 (g), how many mol CO 2 form when 20. mol HCl are consumed? a. 5.0 mol b. 10. mol c. 20. mol d. 40. mol 9. A substance has an empirical formula of CH 2 and a molar mass of 56 grams per mole.
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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Stoichiometry and the Mole - Unit 3: Stoichiometry and the...

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