H for the reaction 2C(s) + 3H2(g)C2H6(g) is -20.24 kcal/mol. To what value of the enthalpy of sublimation of C(s) does this point given that the bond energies of C-C, C-H and H-H are 63 kcal/mol, 85.6 kcal/mol and 102.6 kcal/mol.

1. 124.3 kcal/mol

2. 185.3 kcal/mol

3. 158.3 kcal/mol

4. 211.5 kcal/mol

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