Question

In which reaction do five total molecules of reactants produce four total molecules of products?

Responses

2SO2 + O2→2SO3
2 uppercase S O subscript 2 end subscript plus uppercase O subscript 2 end subscript righwards arrow 2 uppercase S O subscript 3 end subscript

2H2S + 3O2→2SO2 + 2H2O
2 uppercase H subscript 2 end subscript uppercase S plus 3 uppercase O subscript 2 end subscript righwards arrow 2 uppercase S O subscript 2 end subscript plus 2 uppercase H subscript 2 end subscript uppercase O

N2+3H2→2NH3
uppercase N subscript 2 end subscript plus 3 uppercase H subscript 2 end subscript righwards arrow 2 uppercase N H subscript 3 end subscript

SnO2+ 2H2→Sn + 2H2O
uppercase S lowercase n uppercase O subscript 2 end subscript plus 2 uppercase H subscript 2 end subscript righwards arrow uppercase S lowercase n plus 2 uppercase H subscript 2 end subscript uppercase O

Answer 1

2H2S + 3O2 → 2SO2 + 2H2O

Reason: reactants = 2 + 3 = 5 molecules; products = 2 + 2 = 4 molecules.