For water, 1 mole = 18 g= 22.4 liter. How to explain?

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For water, 1 gram is approximately 1 mL.

22.4 L/mol is the molar volume of an ideal gas at STP.

Since water is not a gas at STP, you can't apply that.

If you had one mole substance that is a gas at STP (hydrogen, nitrogen, carbon dioxide, etc.) you could say that they occupy a volume of approximately 22.4 L.

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Abinash Mukherjee
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Abinash Mukherjee

Updated on October 25, 2022

Comments

  • Abinash Mukherjee
    Abinash Mukherjee about 1 year

    For water, 1 mole = 18 g= 22.4 liter. But practically, how 22.4 liter is equal to 18 g?

    • M.A.R.
      M.A.R. about 7 years
      22.4 liters of liquid water does not weigh 18 g. Pay attention to the phase.
  • MaxW
    MaxW about 7 years
    22.4 L/mol is for the "old" STP. The current definition of STP is 0 C and 100 kPa which has a volume of 22.7 L/mol.
  • Chet Miller
    Chet Miller about 7 years
    Water can be a gas if it's water vapor. 22.4 L is the volume of 18 g of water vapor at 1 atm and 0 C.
  • Vlad
    Vlad about 7 years
    Water can't exist in the gaseous state at these conditions.