Question

phosphorus + oxygen - phosphorus pentaoxide

Answer 1

what's your question, if it's chemical reaction then here is your answer:
$P_{4} + 5O_{2} \: \rightarrow \: 2 P_{2}O_{5}$

Answer 2

The balanced equation for the above word equation is given below:
P4 + 5O2 ------>2P2O5

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