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27 August, 16:27

Find the approximate atomic mass of a water molecule (h2o). give your answer in atomic mass units rounded to the nearest whole number.

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  1. 27 August, 16:37
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    First step is to get the mass of water molecule in grams:

    From the periodic table:

    molar mass of hydrogen is 1

    molar mass of oxygen is 16

    molar mass of a water molecule = 2 (1) + 16 = 18 gm

    Now, to convert the gm into amu, all you have to do is multiply the gm you got by Avogadro's number as follows:

    mass of water molecule = 18 x 6.22 x 10^23 = 1.1196 x 10^25 amu which is approximately 1 x 10^25 amu
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