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A mixture of CH(4) and C(2)H(2) occupied...

A mixture of `CH_(4) and C_(2)H_(2)` occupied a certain volume at a total pressure of 63 mm. The sample was burnt to `CO_(2) and H_(2)O` and the `CO_(2)` alone was collected and its pressure was found to be 69 mm in the same volume and at the same temperature as the original mixture. What fraction of the mixture was methane?

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The correct Answer is:
`0.90`
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