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Given the following data
2O3(g) -------> 3 O2 (g) AH= -427
O2(g)----------> 2O9(g) AH= +495
NO(g) + O3(g) ------> NO2(g)+ O2(g) AH= -495
calculate AH for the reaction
NO(g) +O(g) -----> NO2(g)
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