Which of the following equations represents the equation for the fH° for N, N-diethyl-m-toluamide, C12H17NO(l), the active ingredient in some insect repellents?
1. 12 C(s) + 17 H(g) + N(g) + O(g) C12H17NO(l)
2. 12 C(s) + 17/2 H2(g) + 1/2 N2(g) + 1/2 O2(g) C12H17NO(l)
3. 12 C(g) + 17 H(g) + N(g) + O(g) C12H17NO(l)
4. 12 C(l) + 17 H(g) + N(g) + O(g) C12H17NO(l)
5. 12 C(l) + 17 H(l) + N(l) + O(l) C12H17NO(l)