One mole of a monoatomic ideal gas is expanded by a process described by $p V^3 = C$,where $C$ is a constant. The heat capacity of the gas during the process is given by ($R$ is the gas constant).

  • A
    $2 R$
  • B
    $\frac{5}{2} R$
  • C
    $\frac{3}{2} R$
  • D
    $R$

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