Question

For the chemical reaction C2H6 + 137 kJ → C2H4 + H2, the chemical energy of the

A. reactant is greater than the chemical energy of the products.

B. products is greater than the chemical energy of the reactant.

C. reactant and the chemical energy of the products are equal.

D. reaction is conserved.

Answer 1

It's harder to build than break down, but a significant amount of energy is still required. According to the chemical reaction given, ethane becomes ethene.

Answer 2

I still do not get so.. which answer choice is it?

Answer 3

My guess would be A. You are forming a double bond. Double bonds have higher bond energy. For a C-C bond, it's about 163 kj/mol, however, for C=C, it's about 490+ kj/mol.