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CHEMISTRY

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WHAT WILL BE THE BALANCE CHEMICAL FORMULA FOR THIS QOUESTION


ammonia is produced by sythesizing nitrogen and hydrogen gas. if i have 2 mols of nitrogen gas and 5 mols of hydrogen gas, which reagent will run out first??

  • CHEMISTRY -

    I balanced the equation and showed you the long way of doing it before. Here it is again.
    http://www.jiskha.com/display.cgi?id=1289515206

    The short way (but I think harder to understand) follows:
    N2 + 3H2 ==> 2NH3
    2.....5

    2 moles N2*(3moles H2/1 mole N2) = 6 moles H2. Do you have 6 moles H2. No, therefore, N2 (not H2) must be the limiting reagent. You can check it this way.
    5 moles H2 x (1 mole N2/3 moles H2) = 1.667 moles N2. Do you have that much N2? Yes, therefore, N2 (not H2) is the limiting reagent.
    Why do I like the other way.
    1. I think it's easier to understand.
    2. You don't really do any fewer calculations. You MUST do one, then I always feel I must do the second one to check myself so I end up doing two no matter which way I go; it really isn't any shorter for me.
    Now you have both ways. Take you pick.
    Good luck.
    5 moles N2

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