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## Homework Statement

One liter of nitrogen combines with 3 L of hydrogen

to form 2 L of ammonia. If the molecules of nitrogen

and hydrogen have two atoms each, how many atoms of

hydrogen and nitrogen are in one molecule of ammonia?

## Homework Equations

Chemical equations

## The Attempt at a Solution

I didn't know where to start so I looked at the solution key and got this:

The number of liters tells us how many molecules of the original combine to form this number of molecules of the product. Using these numbers as multipliers in a chemical equation gives us

1N

_{2}+ 3H

_{2}→ 1N

_{x}H

_{y}

Making sure that we have the same number of atoms of each kind on each side, we get x = 1 and y = 3.

Can somebody explain to me what the hell just happened?