A 100-ML Sample of Water Is Placed in a Coffee

question 6

Multiple Choice

A 100-mL sample of water is placed in a coffee cup calorimeter. When 1.0 g of an ionic solid is added, the temperature decreases from 21.5°C to 20.8°C as the solid dissolves. Which of the following is true for the dissolving of the solid?

• A) ΔH < 0
• B) ΔS_sys< 0
• C) ΔS_univ > 0
• D) ΔS_surr > 0
• E) none of these

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