The molar specific heat of a gas as given from the kinetic theory is \(\rm\frac{5}{2}\)R. If it is not specified whether it is Cp or Cv, one could conclude that the molecules of the gas
1
are definitely monoatomic
2
are definitely rigid diatomic
3
are definitely non-rigid diatomic
4
can be monoatomic or rigid diatomic
5
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