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# The temperature of an open

Question:

The temperature of an open room of volume $30 \mathrm{~m}^{3}$ increases from $17^{\circ} \mathrm{C}$ to $27^{\circ} \mathrm{C}$ due to sunshine. The atmospheric pressure in the room remains $1 \times 10^{5} \mathrm{~Pa}$. If $\mathrm{n}_{\mathrm{i}}$ and $\mathrm{n}_{\mathrm{f}}$ are the number of molecules in the room before and after heating, then $n_{f}-n_{i}$ will be :-

1. $2.5 \times 10^{25}$

2. $-2.5 \times 10^{25}$

3. $-1.61 \times 10^{23}$

4. $1.38 \times 10^{23}$

Correct Option: , 2

Solution: