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4 November, 15:39

Why does half a mole of water molecules have more mass than 2 moles of helium atoms?

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Answers (2)
  1. 4 November, 17:55
    0
    Mass H2O = 9.01 grams

    Mass He = 8.0 grams

    The mass per mol of water is more than the mass per mol of helium.

    Explanation:

    Step 1: Data given

    Molar mass water = 18.02 g/mol

    Molar mass of helium = 4.0 g/mol

    Number of moles H2O = 0.5 moles

    Number of moles He = 2.0 moles

    Step 2: Calculate mass

    Mass = moles * molar mass

    Mass H2O = 0.5 moles * 18.02 g/mol

    Mass H2O = 9.01 grams

    Mass He = 2.0 moles * 4.0 g/mol

    Mass He = 8.0 grams

    The mass per mol of water is more than the mass per mol of helium.
  2. 4 November, 18:05
    0
    everything (matter) is made up of molecules (atoms)
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