A sample of hydrogen gas was collected over water at 21℃ and 685 mm Hg. The volume of the container was 7.80ltr. Calculate the mass of H2 gas collected ( vapour pressure of water = 18.6 mm hg at 21℃)
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First of all pressure of gas=pressure- vapour pressure
P=666.4 mm Hg = 666.4/760 Pa
V = 7.8 L =0.0078 m³ T=294K
also PV = nRT
On solving for n ,we get
n=0.000002 moles
P=666.4 mm Hg = 666.4/760 Pa
V = 7.8 L =0.0078 m³ T=294K
also PV = nRT
On solving for n ,we get
n=0.000002 moles
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