# What kind of reaction is represented by 4P + 5O_2 -> 2P_2O_5?

$4 P + 5 {O}_{2} \to 2 {P}_{2} {O}_{5}$
$4 P + 5 {O}_{2} \to 2 {P}_{2} {O}_{5}$
When two elements combine to a product of one molecule, the reaction is synthesis, $A + B \to A B$