Answer
$n=5.47\times10^{-8} $ moles
Work Step by Step
The ideal gas law is
$PV=nRT$
Since we need to find $n$, we will rearrange the above equation to make $n$ the subject of the formula:
$n=\frac{PV}{RT}$
Since we know the values of $P,V,R$ and $T$, we substitute these values to find $n$:
$n=\frac{100(1\times10^{-6}m^3)}{8.314(220)}$
$n=5.47\times10^{-8} $ moles