Q.

 22.4L CH4 at 1 atm  and 273 K was thought to have mass 16 g but when weighed experimentally it was found to have 17.5 g due to the presence of carbon-14. Calculate % of carbon atom having atomic mass ' 14 '.

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answer is 75.

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Detailed Solution

Let x is the carbon atom having atomic mass '14. Thus

17.5=x×18+(1x)×16x=0.75
or 75%

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 22.4L CH4 at 1 atm  and 273 K was thought to have mass 16 g but when weighed experimentally it was found to have 17.5 g due to the presence of carbon-14. Calculate % of carbon atom having atomic mass ' 14 '.