Answer:
D.) 2 H₂ + O₂ -----> 2 H₂O
Explanation:
An equation is balanced when there is an equal amount of each element on both sides of the reaction. If these amounts are unequal, coefficients can be added to modify the amount of particular molecules.
A.) Not balanced
2 H₂ + 2 O₂ -----> H₂O
Reactants: 4 hydrogen, 4 oxygen
Products: 2 hydrogen, 1 oxygen
B.) Not balanced
2 H₂ + 2 O₂ -----> 2 H₂O
Reactants: 4 hydrogen, 4 oxygen
Products: 4 hydrogen, 2 oxygen
C.) Not balanced
H₂ + O₂ -----> H₂O
Reactants: 2 hydrogen, 2 oxygen
Products: 2 hydrogen, 1 oxygen
D.) Balanced
2 H₂ + O₂ -----> 2 H₂O
Reactants: 4 hydrogen, 2 oxygen
Products: 4 hydrogen, 2 oxygen
