You can't get an answer without knowing at the very least, the pressure and temperature of the steam and the volume of gas. With this information, see the ideal gas law, PV=nRT. n is number of moles and R is gas constant.
number of moles is the mass / molecular mass (18g/mol for water).
1 cubic metre of water at 0C and standard pressure will have a density of 1g/ml, therefore, 1000kg or 1,000,000g.
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