Question

A hot air balloon can contain upwards of 16,000 L of gas (at STP)

how many combined molecules/atoms of air will be present?

Answer 1

$n=\frac{V}{Vm}=\frac{16000}{22.4}=714.29$ mol

$N=N(A)\times n=714.29\times6\times10^{23}=4285.71\times10^{23}$