JEE MAIN - Physics (2021 - 27th July Morning Shift - No. 2)
The number of molecules in one litre of an ideal gas at 300 K and 2 atmospheric pressure with mean kinetic energy 2 $$\times$$ 10$$-$$9 J per molecules is :
0.75 $$\times$$ 1011
3 $$\times$$ 1011
1.5 $$\times$$ 1011
6 $$\times$$ 1011
Explanation
KE = $${3 \over 2}kT$$
PV = $${N \over {{N_A}}}RT$$
N = $${{PV} \over {kT}}$$
= N = 1.5 $$\times$$ 1011
PV = $${N \over {{N_A}}}RT$$
N = $${{PV} \over {kT}}$$
= N = 1.5 $$\times$$ 1011
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