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2 August, 22:37

One atomic mass unit has a mass of 1.6605 x 10-24 g. What is the mass of one molecule of H2O?

a. 2.991 x 10-23 g

b. 1.6605 x 10-24 g

c. 6.022 x 1023 g

d. 1.6605 x 10-24 u

e. 18.016 g

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Answers (1)
  1. 2 August, 23:06
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    2.99*10⁻²³ g. Option a

    Explanation:

    Water → H₂O

    We determine the molar mass of water → 1 g/mol. 2 + 16g/mol. 1 = 18g/mol

    The molar mass means that 1 mol of water weighs 18 g.

    We know that 1 mol contains 6.02*10²³ molecules. Therefore we would make a rule of three:

    6.02*10²³ molecules of water weigh 18 g

    1 molecule of water may weigh (1. 18) / 6.02*10²³ = 2.99*10⁻²³ g
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