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  4. The number of moles of H 2 in 0.224 L of hydrogen gas at STP ( 273 K , 1 atm ) assuming ideal gas behaviour is

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Q. The number of moles of $H _{2}$ in $0.224\, L$ of hydrogen gas at STP ( $273 \,K , 1 \,atm$ ) assuming ideal gas behaviour is

Solution:

Applying $PV = nRT$,
$P =1 \,atm , V =0.224\, L , R =0.821 \,L \,atm K ^{-1} mol ^{-1}$
$T =273 \,K$
$n=\frac{1 \times 0.224}{0.0821 \times 273}=0.01$