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A gas evolved during the fermentation of sugar was collected at22.5oC and 702 mmHg. After purification its volume was found to be25.0 L. How many moles of gas were collected?

0.95 mol
1.05 mol
12.5 mol
22.4 mol
724 mol

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Keith Leannon
Keith LeannonLv2
28 Sep 2019

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When Zn reacts with HCl solution, the products are H2 gas and ZnCl2. A volume of 426 mL of H2 gas is collected over water at a total pressure of 751 mmHg and 16∘C. The vapor pressure of water at 16∘C is 14 mmHg.
Zn(s)+HCl(aq) → H2(g)+ZnCl2(aq).

1.What was the partial pressure of the H2 gas?

2.How many moles of H2 gas were produced in the reaction?

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