Question

3) How does the entropy change in each of the following reactions?

3.1) Steam heats from 100˚C to 120˚C a) Entropy Decreases b) Entropy Increases c) No Change

3.2) A pound of Sucrose crystals dissolve in water a) Entropy Decreases b) Entropy Increases c) No Change

3.3) Hydrogen gas is cooled from 60˚C to 80 ˚C a) Entropy Decreases b) Entropy Increases c) No Change

3.4) CO2 is frozen to form dry ice a) Entropy Decreases b) Entropy Increases c) No Change

3.5) 2 CH3CH3 (g) +7 O2 (g) → 4CO2 (g) + 6H2O (g) a) Entropy Decreases b) Entropy Increases c) No Change

Answer 1

3.1)

Steam heats from 100˚C to 120˚C

b) Entropy Increases

3.2)

A pound of Sucrose crystals dissolve in water

b) Entropy Increases

if sucrose dissolve in water. then it forms liquid solution. then the randomness increases. so entropy increses

3.3)

Hydrogen gas is cooled from 60˚C to 80 ˚C

a) Entropy Decreases

3.4)

CO2 is frozen to form dry ice

a) Entropy Decreases

gas to solid , molecules randomness is decreases. so entropy decreases

3.5)

2 CH3CH3 (g) +7 O2 (g) → 4CO2 (g) + 6H2O

b) Entropy Increases

here number of moles of products is more than the number of moles of reactants. so entropy increases.