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How many water molecules are in a 10.0g sample of water?

  • chemistry -

    First you need the molar mass of water(H2O).

    Given that oxygen is 16 g mole^-1 and hydrogen is 1 g mole^-1 the molar mass of water is 18 g mole^-1.

    Next we need the number of moles of water that 10.0 g represents (N) which we get from

    N=10.0 g / 18 g mole^-1

    as one mole contains 6x10^23 molecules then

    Nx6x10^23 is the number of molecules.

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