Question
Asked Apr 5, 2019
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Small quantities of hydrogen gas can be prepared by the addition of hydrochloric acid to zinc.  A sample of 195 mL of hydrogen was collected over water at 25o C and 753 torr.  What mass of hydrogen was collected? (Pwater = 24 torr at 25o C)

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Expert Answer

Step 1

Total pressure = Pressure of H2 gas + pressure of H2O vapor

 

Therefore, Pressure of H2 gas = Total pressure - pressure of H2O vapor

 

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Step 2

Converting pressure in torr to atm,

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Step 3

Number of moles of H2, can be calculated...

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