# 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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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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Step 1

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

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

Step 2

Converting pressure in torr to atm,

Step 3

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

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