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The temperature of an open room of volume \( 30 \mathrm{~m}^{3} \) increased from \( 17^{\circ} \mathrm{C} \) to \( 27^{\circ} \mathrm{C} \) due to the sunshine. The atmospheric pressure in the room remains \( 1 \times 10^{5} \mathrm{~Pa} \). If \( n_{\mathrm{i}} \) and \( n_{f} \) are the number of molecules in the room before and
\( \mathrm{P} \) after heating, then \( n_{f}-n_{i} \) will be
[JEE (Main) 2017]
(a) \( -2.5 \times 10^{25} \)
(b) \( -1.61 \times 10^{23} \)
(c) \( 1.38 \times 10^{23} \)
(d) \( 2.5 \times 10^{25} \)
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