Question

In which casechange in entropy is negative?
(1) Evaporation of water
(2) Expansionofa gas at constant temperature
(3) Sublimation ofsolid to gas
(4) 2H(g) + H₂(g)

Answer 1

Answer:

(4) 2H(g) + H₂(g) is right answer

Answer 2

Entropy is negative

(4) 2H(g) + H₂(g)

Explanation:

Entropy

• It has a symbol of S.
• It is state function.
• It is a measure of disorder in a system.

         S=K ln W

Where k is proportionality constant, which is same to ideal gas R divided by Avogadro’s number and ln W is the natural logarithm of w.

• System is directly proportional to entropy of system.

• 2H (g) + H₂ (g), when entropy of reaction less than zero.
• Entropy of reaction is greater than zero when expansion of gas at constant temperature and also sublimation of solid to gas.
• Evaporation of water, when entropy of reaction is greater than zero.

To learn more...

1. https://brainly.in/question/9667707
2. https://brainly.in/question/9931339