We have a standard condition to compare volume of gas called STP (Standard Temperature and Pressure)
STP: 1atmosphere of pressure and a temperature of 0°C or 273.15K.
At STP, 1 mole of gas occupies 22.4L
Thus we can create the conversion factors: 22.4L/mol & 1mol/22.4L
Ex. Calculate the volume occupied by 32Kg of oxygen at STP
32*10^3/16=2000mol
200*22.4=45000L
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