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31 May, 15:51

How many molecules of NH3 are produced from 4.72x10 negative 4 power g of H2?

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  1. 31 May, 16:09
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    9.40x10^19 molecules.

    The balanced equation for ammonia is:

    N2 + 3H2 = = > 2NH3

    So for every 3 moles of hydrogen gas, 2 moles of ammonia is produced. So let's calculate the molar mass of hydrogen and ammonia, starting with the respective atomic weights:

    Atomic weight nitrogen = 14.0067

    Atomic weight hydrogen = 1.00794

    Molar mass H2 = 2 * 1.00794 = 2.01588 g/mol

    Molar mass NH3 = 14.0067 + 3 * 1.00794 = 17.03052 g/mol

    Moles H2 = 4.72 x 10^-4 g / 2.01588 g/mol = 2.34140921086573x10^-4 mol

    Moles NH3 = 2.34140921086573x10^-4 mol * (2/3) = 1.56094x10^-4 mol

    Now to convert from moles to molecules, just multiply by Avogadro's number: 1.56094x10^-4 * 6.0221409x10^23 = 9.400197448261x10^19

    Rounding to 3 significant figures gives 9.40x10^19 molecules.
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