Predict whether the entropy change is Greater or less than zero for each of following processes?
1) freezing of water?
2) cooling of gas from 80 degree Celsius to 20 degree Celsius?
3) evaporating ethanol at room temperature

Dear Student,

a) Entropy decreases. : On freezing water it converts to solid state and in solid state randomness of the molecule is very less and entropy is a measure of randomness.

c) On evaporation of ethanol, liquid ethanol is converting to vapour form then entropy increases as randomness is more in vapour phase.

Regards

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