Match the missing coefficient to the correct number of molecules so that the equation adheres to the conservation of mass.

(X)N2 + (Y)H2 → (Z)NH3

Column A
1. X
2. Y
3. Z
Column B
a.3
b.2
c.1

1. X - b. 3

2. Y - b. 2
3. Z - c. 1