Question

A gas occupies $56\text{L}$ at 1 atm and $273\text{K}$. the number of moles of the gas present is:

Answer 1

Volume occupied by 1 mole of the gas at STP = $22.4\text{L}$
$56\text{L}$ will be occupied by, $\frac{1}{22.4}\times 56=2.5\text{moles}$