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Sunlight causes the following reaction to take place in the atmosphere: NO2(g) NO(g) + O(g). Calculate the standard enthalpy of the reaction from the following information and from additional information in Appendix 2A. O2(g) 2 O(g) ?H° = +498.4 kJ NO(g) + O3(g) NO2(g) + O2(g) ?H° = -200. kJ

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