• at 30.0°C, water has a vapor pressure of 31.8 mmHg
Ideal gas equation: moles H2
mass = moles x molar mass
Molar mass of H2:
2 H x 1.01 g/mol = 2.02 g/mol
The hydrogen gas formed in a chemical reaction is collected over water at 30.0 oC at a total pressure of 734 mm Hg .
If the total volume of gas collected is 724 mL , what mass of hydrogen gas is collected?
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