Equal weights of ethane and hydrogen are mixed in an empty container at 25oC. The fraction of the total pressure exerted by hydrogen is:
A
1:2
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B
1:1
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C
1:16
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D
15:16
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Solution
The correct option is D15:16 Let xg of each gas is mixed.
Moles of ethane = x30
Moles of hydrogen= x2
Mole fraction of hydrogen = x2x2+x30=1516 Partial pressure ofH2Total pressure=Mole fraction of hydrogen =15:16