What is the overall reaction equation? upper n upper h subscript 3 (g) plus one half upper c upper h subscript 4 (g) right arrow 3 upper h subscript 2 (g) plus one half upper h upper c upper n (g). Upper h upper n subscript 3 (g) plus upper c upper h subscript 4 (g) right arrow 6 upper h subscript 2 (g) plus upper h upper c upper n (g). Upper h upper n subscript 3 (g) plus upper c upper h subscript 4 (g) right arrow 3 upper h subscript 2 (g) plus upper h upper c upper n (g).