Question

What are the signs of delta h and delta s for the reaction 2cl = cl2?

Answer 1

here bond is formed, so delta H is positive
no of moles of products are decresed,so Entropy is decreased and delts S is negative

Answer 2

Answer: Signs of $\Delta H$ is negative and $\Delta S$ is negative for the reaction $2Cl\rightarrow Cl_2$.

Explanation: Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

In the given reaction: -

$2Cl\rightarrow Cl_2$ is an exothermic reaction as heat is released in formation of bonds and two atoms are joining to form a single molecule hence entropy is decreasing.

Thus $\Delta H$ is negative and $\Delta S$ is negative.