Hydrogen, H2,and nitrogen, N2(g), combined to form ammonia, NH3(g):3H2+N2–>2NH3(g) what amount, in moles, of nitrogen will react 18 mols of hydrogen

In this reaction, of  will react with of .

Explanation:

In the balanced equation for this reaction, the ratio between the coefficient of and is . That is: . That's the same as saying that for every one mole of consumed, three moles of will be consumed.

Rewrite this ratio as a fraction:

.

Take the reciprocal of both sides to obtain:

.

It is given that of was consumed; in other words, . The question is asking for , the number of moles of required. Apply this ratio:

.

Hence the conclusion: in this reaction, it will take (at least) of to react with of .