1. One mole of solid sodium chloride (NaCl) is dissolved in 1 L of water. Predic

ID: 970738 • Letter: 1

Question

1. One mole of solid sodium chloride (NaCl) is dissolved in 1 L of water. Predict if entropy increases or decreases as a result of this process.

i. increases

ii. decreases

2. A sample of water undergoes the phase changes listed. For each change, predict if entropy will increase or decrease.

(a) liquid to gas

i. increase

ii. decrease

(b) liquid to solid

i. increase

ii. decrease

3. A sample of liquid water at 85°C is cooled to 50°C. How does entropy change as the sample is cooled?

i. increases

ii. decreases

1) As dissolvation happens randomness increases hence entropy increases

2) ( a) liquid to gas entropy increases

( b) liquid to solid entropy decreases

3) entropy decreases as liquid water is cooled from 85 to 50

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