Explanation:
The reaction expression is given as;
2H₂[tex]_{g}[/tex] + O₂[tex]_{g}[/tex] → 2H₂O[tex]_{l}[/tex]
From the balance reaction expression:
2 mole of hydrogen gas combines with 1 mole of oxygen gas on the reactant side;
This produces 2 mole of water on the product side of the expression.
The product is in liquid form.
This reaction is a synthesis reaction because a single product is formed from two reactants.