Nitrogen gas (N2) and hydrogen gas (H2) combine to form ammonia (NH3).

Which equation correctly represents this reaction?

Responses

N2 + 3H2 → 2NH3

upper case N subscript 2 end subscript plus 3 upper case H subscript 2 end subscript rightward arrow 2 upper case N H subscript 3 end subscript,

N + H → NH

upper case N plus upper case H rightward arrow upper case N H,

2NH → N + 3H2

2 upper case N H rightward arrow upper case N plus 3 upper case H subscript 2 end subscript,

2N2 + H2 → 3NH3

2 upper case N subscript 2 end subscript plus upper case H subscript 2 end subscript rightward arrow 3 upper case N H subscript 3 end subscript,