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Pressure

Equal masses ...

Question

Equal masses of ethane and hydrogen are mixed in an empty container at 298 K. The fraction of total pressure exerted by hydrogen is

A

15 : 16

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B

1 : 1

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C

1 : 4

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D

1 : 6

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Solution

The correct option is A 15 : 16
$P_{H_{2}} \propto x_{H_{2}}$
$\frac{P_{H_{2}}}{P_{T}} = x_{H_{2}} = \frac{x_{H_{2}}}{x_{2} + x_{e t h a n e}}$
$x_{H_{2}} = \frac{w / 2}{(w / 2) + (w / 30)} = \frac{15}{16}$

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