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A closed vessel with rigid walls contain...

A closed vessel with rigid walls contains 1 mole of `._(92)^(238)U` and 1 mole of air at `298K`. Considering complete decay of `._(92)^(238)U` to `._(82)^(206)Pb`the ratio of the final pressure to the initial pressure of the system at `298K` is

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The correct Answer is:
9
`""_(92)^(238)U rarr ""_(82)^(206)P + 8 ""_(2)^(4)He + 6 ""_(-1)^(0)e`
`(P_("final"))/(P_("intial"))= (8 (He) + 1 ("air"))/(1("air"))`
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