Question

Which equation is balanced?
Responses

4P+5O2→2P2O5

4 uppercase P plus 5 uppercase O subscript 2 end subscript rightwards arrow 2 uppercase P subscript 2 end subscript uppercase O subscript 5 end subscript

P+2O2→PO2

uppercase P plus 2 uppercase O subscript 2 end subscript rightwards arrow uppercase P O subscript 2 end subscript

2P+O2→P2O5

2 uppercase P plus uppercase O subscript 2 end subscript rightwards arrow uppercase P subscript 2 end subscript uppercase O subscript 5 end subscript

4P+2O2→2P4O5

Answer 1

The balanced equation is:
4P + 5O2 → 2P2O5

Check: left P = 4, O = 5×2 = 10; right P = 2×2 = 4, O = 2×5 = 10.

The others are not balanced (their atom counts don't match).