In general 1 volume of water is equal to 22.4 liter for calculationmolar volume, the volume occupied by a mole of a substance at STP. According to Avogadro's law, at a given temperature and pressure a given volume of any gas contains the same number of molecules. At STP 1 mole of gas occupies 22.414 liters. This volume is what is usually meant by the molar volume, although one can also speak of molar volumes of substances that are not gaseous at STP. Since at STP water occupies very nearly 1 cc per gram, and since 1 mole of water molecules weighs very nearly 18 grams, the molar volume of water is about 18 cc. The molar volume of osmium, one of the densest metals, is only about 8.4 cc; that of beryllium is only about 4.86 cc.STP means standard temperature and pressure..
Temperature is 25 deg. C or 298 deg Kelvin..
Pressure is 1 atmosphere.. 1.013 * 10^5 Pascal or N/m² or 1 bar
take 1 litre of water 1 kg .
One litre of water contains 1000 gms/ 18 gms = 500/9 moles of water.
At STP one mole of an ideal gas occupies 22.4 litres. So 500/9 moles occupy 500 * 22.4/9
one volume of water is equal to 1244.44 volumes of steam.
. One mole of steam will occupy 22, 400 cc of volume of ideal gas.
So 18 cc water 22, 400 cc of steam
1 volume of water 22, 400 / 18 volumes of steam.