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Use Hess's law to predict the enthalpy change for the reaction; HCl(g) + NaNO2(s) ---> HNO2 + NaCl(s) using the following information: 1) 2NaCl + H2O --> 2 HCl + Na2O delta H= -507 kJ 2) NO + NO2 + Na2O --> 2 NaNO2 delta H= -427 kJ 3) NO + NO2 --> N2O + O2 delta H= -43 kJ 4) 2 HNO2 --> N2O + O2 + H2O delta H= 34 kJ