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How many moles of helium at temperature ...

How many moles of helium at temperature 300K and 1.00 atm pressure are needed to make the internal energy of the gas 100J?

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The correct Answer is:
A, B
Helium is monoatomic. So, degree of freedom `f=3`.
`U=(nf)/(2)RT=(3n)/(2)RT`
or `n=(2U)/(3RT)=(2xx100)/(3xx8.31xx300)`
`=2.67xx10^-2mol`
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