Question

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Balance of Atoms Quick Check
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Question
It takes 1 molecule of nitrogen and 3
molecules of hydrogen to produce 2
molecules of ammonia using the following formula:

1N2+ 3H2 → 2NH3

Identify which combination of molecules will produce ammonia with no leftovers?

(1 point)
Responses

4N2
and 4H2
4 n sub 2 and 4 h sub 2

8N2
and 4H2
8 n sub 2 and 4 h sub 2

Answer 1

Neither. The reaction needs H2 : N2 = 3 : 1.

- For 4 N2 you would need 12 H2 (not 4 H2).
- For 8 N2 you would need 24 H2 (not 4 H2).

With 4 N2 + 4 H2, H2 is limiting: 3 H2 react with 1 N2 → 2 NH3, leaving 1 H2 and 3 N2 unused.
With 8 N2 + 4 H2, H2 is limiting: same result scaled up (only 1 full reaction), leaving 1 H2 and 7 N2 unused.

Correct no‑leftover combos are 1 N2 + 3 H2 (or any multiple: 2 N2 + 6 H2, 4 N2 + 12 H2, etc.).