Writing and Balancing Chemical Equations

Question 13 • IA-Chemistry A Survey of Chemistry A

Which equation obeys the law of conservation of mass?

Answer

H2(g) + O2(g) → H2O(g)

H2(g) + O2(g) → H2O(g) +4He(g)

2H2(g) + O2(g) → 2H2O(g)

H2(g) → H2O(g)

H2(g) + O2(g) → 2H2O(g)

Explanation

The law of conservation of mass requires the same number of each type of atom on both sides of the equation. In 2H2(g) + O2(g) → 2H2O(g), there are 4 hydrogen atoms and 2 oxygen atoms on each side. Therefore, the equation with 2H2 and 2H2O obeys the law of conservation of mass.

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