In which case change in entropy is negative?
- AEvaporation of water
- BExpansion of a gas at constant temperature
- CSublimation of solid to gas
- D2H(g)→H
2
(g)
Solution & Step-by-step Explanation
Entropy (ΔS) is a measure of randomness.
Evaporation, sublimation, and expansion increase randomness (ΔS>0).
2H(g)→H
2
(g): Two moles of gas atoms combine to form one mole of gas molecules. The number of gaseous particles decreases, reducing the degree of randomness. Thus, ΔS<0 (negative).
Evaporation, sublimation, and expansion increase randomness (ΔS>0).
2H(g)→H
2
(g): Two moles of gas atoms combine to form one mole of gas molecules. The number of gaseous particles decreases, reducing the degree of randomness. Thus, ΔS<0 (negative).