HI,
22.4 L/mol is the molar volume of an ideal gas at STP.
Since water is not a gas at STP, this can’t be applied.
M.W of Water=18g/ml
Water is 1 ml=1 gm, So 1000ml=1000gm.
Hence 1000/18=55.56 moles in 1000 ml of water.
Hope this helps.
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