(answered on edge) Calculate the percent by mass of each element.

%N = 35 %

%H = 5.0 %

%O = 60 %

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.

Nonmetals usually react by gaining electrons