1 mole of ideal monatomic gas at $27^{\circ}C$ expands adiabatically against a constant external pressure of $1.5\: atm$ from a volume of $4\: dm^3\: to\: 16\: dm^3$ . Calculate $\Delta E$.

Question

$\begin {array} {1 1} (A)\;1823.85\: J & \quad (B)\;- 1823.85 \: J \\ (C)\;3039.75 \: J & \quad (D)\;-3039.75 \: J \end {array}$