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Q.
How many moles of helium gas occupy $22.4 L$ at $0^{\circ} C$ and 1 atm pressure?
Bihar CECEBihar CECE 2010
Solution:
$\because 22.4 \,L$ is the volume that is occupied by one mole of a gas at $0^{\circ} C$ and 1 atm pressure.
$\therefore 22.4 \,L$ of He at $O^{\circ} C$ and 1 atm pressure $=1 \,mol$