Ex1. From the following heats of reaction, calculate the heat of reaction for [-297 kJ] 2 SO2(g) + 02(g) > 2 SO3(g) AH = - 196 kJ 2 S(s) + 3 02(g) > 2 SO3 (8) AH = - 790 kJ S(s) + 02(g) -> SO2(g) AH = ? kJ 2) Use Hess's law to calculate the enthalpy of the reaction below using the following information. [-78.5] HCI(g) + NaNO2(s) - HNO2(1) + NaCl(s) AH= ? 2NaCI(s) + H2O(1) - 2HCI(g) + NazO(s) AH = 507 kJ NO(g) + NO2(g) + NazO(s) - 2NaNO2(s) AH = -427 kJ NO(g) + NO2(g) - N20(g) + 02(g) AH = -43 kJ 2HNO2(1) - N20(g) + Oz(g) + H20(1) AH = 34 kJ