The mass of 5.6 dm3 of a certain gas at STP is 12.0 g. Calculate the relative molecular mass of the gas.
5.6 dm3 weighs 12 g
∴ 22.4 dm3 weighs 125.6\dfrac{12}{5.6}5.612 x 22.4 = 48 g
Hence, relative molecular mass of the gas = 48 amu
