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MCAT Question A Day - 2/16/14

The heat of combustion of gaseous ammonia, NH3(g), is 81 kcal/mole. How much heat is released in the reaction of 34 grams of ammonia with excess oxygen? 

A.  40.5 kcal 
B.  60.3 kcal 
C.  75.8 kcal 
D.  81 kcal