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17 August, 22:24

What mass of hydrogen contains the same number of atoms as 7.00 g of nitrogen

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  1. 17 August, 22:57
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    Molecular mass of nitrogen, N2 = 2*14 = 28

    molecular mass of hydrogen, H2=2*1 = 2

    Molecules of both elements contain 2 atoms, so the ratio of molecules is the same as the ratio of atoms.

    From the molecular masses above,

    ratio of number of molecules = ratio of molecular masses, therefore

    7g N2 : x g H2 = 28:2

    cross multiply:

    x=7*2/28=0.5 g of Hydrogen has the same number of atoms as 7 g of nitrogen (at room temperatures)
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