a) Calculate the total masses of the reactants in equation 4NH3(g) 5O2(g) → 4NO(g) 6H2O(g) Express your answer using
a) Calculate the total masses of the reactants in equation 
4NH3(g) 5O2(g) → 4NO(g) 6H2O(g)
Express your answer using four significant figures.
b) Calculate the tota...