If $c_p$ and $c_v$ denote the specific heats (per unit mass) of an ideal gas of molecular weight $M$,then which of the following relations holds true,where $R$ is the molar gas constant?

  • A
    $c_p - c_v = R/M^2$
  • B
    $c_p - c_v = R$
  • C
    $c_p - c_v = R/M$
  • D
    $c_p - c_v = MR$

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