Question

When burning methane gas, which outcome best demonstrates the law of conservation of mass?

A.
CH4 → CO2 + H20

B.
CH4 + O2→ CO2 + 2H20

C.
CH4 + O2 → 2CO2 + 2H20

D.
CH4 + 2O2 → CO2 + 2H20

Answer 1

Answer  Option D

Counting the  number of atoms each side of the equation shows that the numbers balance.