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9 August, 22:12

How many molecules are in 128g of H2O?

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  1. 10 August, 00:30
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    4.28x10^24 molecules

    Explanation:

    From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules. From the above, we understood that 1mole of H2O also contains 6.02x10^23 molecules.

    1mole of H2O = (2x1) + 16 = 2 + 16 = 18g

    Now, if 18g of H2O contains 6.02x10^23 molecules,

    Then 128g of H2O will contain = (128x 6.02x10^23) / 18 = 4.28x10^24 molecules
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