Balance the following equations for both mass and charge. a. C3H8O (l) + O2 (g) ? CO2 (g) + H2O (l) b. K2S (aq) + Ni(NO3)2 (aq) ? KNO3 (aq) + NiS (s) c. As2O3 (s) + NO3-(aq) ? H3AsO4 (aq) + NO(g) (acid conditions) d. PCl3 (g) + NH3 (g) ? P(NH2)3 (g) + HCl (g) e. C3H6 (g) + NH3 (g) + O2 (g) ? C3H3N (g) + H2O (g)