At STP, a given volume has the same number of moles. So, no. of moles= 22.4÷24= 0.93333mol (5 s.f.)
Number of molecules= no. of moles × 6×10^23 , which would give us the same number of molecules since the number of moles are the same.
However, mass of a gas depends on the mr of the gas.
This is because the formula for the mass of a gas is mole× mr.
Since different gases would have different mr, mass would differ.
