The temperature of an open room of volume $30 m^3$ increases from $17^{\circ}C$ to $27^{\circ}C$ due to the sunshine. The atmospheric pressure in the room remains $1×10^5\; Pa$.If $n_i$ and $n_f$ are the number of molecules in the room before and after heating, then $n_f−n_i$ will be :

Question

$\begin{array}{1 1}(1) -1.61 \times 10^{23} \\(2) 1.38 \times 10^{23} \\(3) 2.5 \times 10^{25} \\(4) -2.5 \times 10^{25} \end{array}$