$A$ gas is allowed to expand against a constant external pressure of $2.5 \ bar$ from an initial volume of $2.5 \ L$ to a final volume of $4.5 \ L$. What is the amount of work done (in $J$)?

  • A
    $-375$
  • B
    $-650$
  • C
    $-250$
  • D
    $-500$

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