Consider the following reaction:

2hcl(g) + 185 kj → h2(g) + cl2(g)
describe the change in energy according to the law of conservation of energy.
a) there is a net gain of 185 kj of energy when decomposing hcl.
b) it takes more energy to break the bonds of hcl than form h2(g) + cl2(g).
c) the energy required to decompose hcl and produce h2(g) + cl2(g) are equal.
d) it takes less energy to break the bonds of hcl than form the bonds of h2(g) + cl2(g.)

For the given reaction, according to the Law of Conservation of Energy, the energy required to decompose Hcl and produce are equal.

Option C

Explanation:

According to law of conservation's of energy, energy can only be transferred from reactants to product side. So in this process, it is stated that 185 kJ of energy will be needed to decompose it. So that 185 kJ of energy will be getting transferred to produce the creation of hydrogen and chloride in the product side.

So if we see from the reactants side, the energy of 185 kJ is required for decomposition of hydrogen chloride. Similarly, if we see from the product side, the 185 kJ utilized for decomposition is transferred as energy required to create hydrogen and chlorine atoms. This statement will be in accordance with the law of conservation's of energy.