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20 May, 19:52

1. What is the mass of 105.00 moles of H20?

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Answers (2)
  1. 20 May, 20:07
    0
    1891.575 g.

    Explanation:

    The molar mass of water = 2 * 1.008 + 15.999 = 18.015 g.

    So 105 moles = 1891.575 g.
  2. 20 May, 20:21
    0
    The average mass of one H2O molecule is 18.02 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.
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