Question

When heat is applied to a solid and a gas begins to form, the change in entropy is positive. true fals?

Answer 1

At decomposition of solid substance with formation of gas leads to increase in an entropy. For example,

                   60°C
NH₄NO₂(s)   =     N₂(g) + 2H₂O(l)

true

Answer 2

Answer: The given statement is true.

Explanation:

Entropy means the degree of randomness. As in a solid molecules are held much more closer to each other due to strong intermolecular forces of attraction.

Hence, they have definite shape and volume. Whereas in gases molecules are far away from each other as they have more kinetic energy.

So, when a solid changes into gases then it means there occurs increase in degree of randomness. Hence, the entropy is positive for this change.

Therefore, we can conclude that the statement when heat is applied to a solid and a gas begins to form, the change in entropy is positive, is true.