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Question
Which of the following reactions corresponds to the thermochemical equation for the standard enthalpy of formation of N,N-diethyl-m-toluamide, C12H17NO(l), the active ingredient in some insect repellents?
A) 12C(l) + 17H(l) + N(l) + O(l) →C12H17NO(l)
B) 12C(g) + 17H(g) + N(g) + O(g) →C12H17NO(g)
C) 12C(s) + 17H(g) + N(g) + O(g) →C12H17NO(l)
D) 12C(s) + 
H2(g) + 
N2(g) + O2(g) →C12H17NO(l)
E) 12C(g) + 17H(g) + N(g) + O(g) →C12H17NO(l)
Answer
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