The hydrogen generated in a reaction is collected over water and occupies 425 ml at 18 c and 742 torr. what is the volume of the dry h2

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Adriana Mcintosh

Chemistry

13 May, 06:03

The hydrogen generated in a reaction is collected over water and occupies 425 ml at 18 c and 742 torr. what is the volume of the dry h2

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Tatum Rowe · Answer 1

The vapor pressure of water at 18 degrees C is 15.5 torr. Based on Dalton's Law of Partial Pressures, this means that the fraction of water is 15.5 torr / 742 torr = 0.02089. Then the fraction of dry hydrogen is 1 - 0.02089 = 0.97911. To calculate for the volume of dry hydrogen, we multiply the total volume of 425 mL by 0.97911 to get the answer of 416.12 mL of dry H2.