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8 November, 14:48

Ammonia is a gas with a characteristic pungent odor. It is sold as a water solution used in household cleaning. The gas is a compound of nitrogen and hydrogen in the atomic ratio 1:3. A sample of ammonia contains 7.933 g N and 1.712 g H. What is the atomic mass of N relative to H?

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  1. 8 November, 14:55
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    Atomic mass of N relative to H is 13.9.

    In periodic table mass of N is around 14 RAM

    Explanation:

    1 mol of ammonia has 1 mol of N, and 3 mole of H

    NH₃

    1 mol of H weighs 1 g, so the mole of H, present in ammonia are:

    1.712 g / 1 g/m = 1.712 mole

    Since the ratio is 1:3

    1.712 mole/3 = 0.57 mole of N are present in the amonia

    To calculate the atomic mass of N relative to H, let's consider it as molar weight.

    Molar weight = mass / mole

    7.933 g / 0.57 mole = 13.9 g/m
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