N2 + O2 --> 2 NO delta H = 43.2 kcal. Which is true: 1. 43.2 kcal consumed when 1 g of N2 reacts. 2. 43.2 kcal consumed when 1 g of O2 reacts. 3. 43.2 kcal consumed when 1 mol of O2 reacts. 4. 43.2 kcal consumed when 1 mol of NO is produced.
by 
rudolf
ANSWERS: 1
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It takes heat to make 2NO, the reaction is endothermic, taking 43.2kcal per mol It's per mol of each item in the equation, so its 42.kcal for: 1 mol of N2 1 mol of O2 making 1 mol of 2NO = 2 mol of NO This should help you decide what the answer is.
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