The value of $\Delta E$ for reversible isothermal evaporation of $90g$ of water at $100^{\circ}C$. Assume that water vapor behaves as ideal gas and $\Delta H_{vap}$ of water is $540\: cal/g(R = 2\: cal/molK)$

Question

$\begin {array} {1 1} (A)\;44870 \: cal & \quad (B)\;-44870\: cal \\ (C)\;52330 \: cal & \quad (D)\;-52330\: cal \end {array}$