# Calculate ΔH° in kilojoules for the following reaction, the preparation of the unstable acid nitrous acid, HNO2. (4 marks) HCl(g) + NaNO2(s) –> HNO2(l) + NaCl(s) Use the following thermochemical equations. 2 NaCl(s) + H2O(l) –> 2 HCl(g) + Na2O(s) ΔH° = +507.31 kJ NO(g) + NO2(g) + Na2O(s) –> 2 NaNO2(s) ΔH° = -427.14 kJ NO(g) + NO2(g) –> N2O(g) + O2(g) ΔH° = -42.68 kJ 2 HNO2(l) —> N2O(g) + O2(g) + H2O(l) ΔH° = +34.35 kJ

Question-AnswerCategory: Material And Energy BalanceCalculate ΔH° in kilojoules for the following reaction, the preparation of the unstable acid nitrous acid, HNO2. (4 marks) HCl(g) + NaNO2(s) –> HNO2(l) + NaCl(s) Use the following thermochemical equations. 2 NaCl(s) + H2O(l) –> 2 HCl(g) + Na2O(s) ΔH° = +507.31 kJ NO(g) + NO2(g) + Na2O(s) –> 2 NaNO2(s) ΔH° = -427.14 kJ NO(g) + NO2(g) –> N2O(g) + O2(g) ΔH° = -42.68 kJ 2 HNO2(l) —> N2O(g) + O2(g) + H2O(l) ΔH° = +34.35 kJ

Calculate ΔH° in kilojoules for the following reaction, the preparation of the unstable acid nitrous acid, HNO2. (4 marks)

HCl(g) + NaNO2(s) –> HNO2(l) + NaCl(s)

Use the following thermochemical equations.

1. 2 NaCl(s) + H2O(l) –> 2 HCl(g) + Na2O(s) ΔH° = +507.31 kJ

1. NO(g) + NO2(g) + Na2O(s) –> 2 NaNO2(s) ΔH° = -427.14 kJ

1. NO(g) + NO2(g) –> N2O(g) + O2(g) ΔH° = -42.68 kJ

1. 2 HNO2(l) —> N2O(g) + O2(g) + H2O(l) ΔH° = +34.35 kJ  