s10q05 - 1. Chem 171 Quiz 5 Version A A liquid whose has a...

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Chem 171 Quiz 5 Version A 1. A liquid whose has a composition of 84.1% carbon and 15.9% hydrogen by mass. What is the empirical formula? C = 12.01, O = 16.00, H=1.01 84.1 g C x 1 mol / 12.01 g = 7.00 mol C 15.9 g H x 1 mol / 1.01 g = 15.8 mol C 7.00 H 15.7 C 7.00/7.00 H 15.7/7.00 C 1.00 H 2.24 C 1.00 H 2.24 x 4 C 4 H 8.96 C 4 H 9 2. What is the purpose of the experiment entitled “Reactivity of Metals”? What parameter do you determine? The reactivity of a metal with hydrochloric acid will be determined. From the reactivity, the equivalent mass of the metal will be determined. Chem 171 Quiz 5 Version B 1. Glucose has the molecular formula C 6 H 12 O 6 . What is the empirical formula and what is the percent composition of glucose? C = 12.01, O = 16.00, H=1.01 CH 2 O is the empirical formula 6 mol C x12.0 g C / mol = 72.0 g C 12 mol H x 1.01 g H / mol = 12.1 g H 6 mol O x 16.0 g O / mol = 96.0 g O 72.0 g C + 12.1 g H + 96.0 g O = 180.1 g %C = 72.0 g C / 180.1 g x 100% = 40.0 % %H = 12.1 g H / 180.1 g x 100% = 6.72 %
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This note was uploaded on 03/08/2011 for the course CHEM 171 taught by Professor Several during the Spring '08 term at Rutgers.

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s10q05 - 1. Chem 171 Quiz 5 Version A A liquid whose has a...

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