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A mixture of nitrogen gas and hydrogen gas reacts in a closed container to form ammonia

gas. The reaction ceases before either reactant is completely consumed. At this stage the
container has 3.0 mol each of all three gases; nitrogen, hydrogen and ammonia. How many
moles of hydrogen and nitrogen were present initially?

i'm not even sure how to start this question honestly.

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  1. I don't think this problem can be worked without knowing Keq. You could calculate Keq if you had the volume.

    N2 + 3H2 ==> 2NH3

    Keq = (NH3)^3/(N2)(H2)^3.
    Substitute and solve for Keq.

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