(Answered) When a 782-g sample of solid potassium hydroxide dissolves

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When a 7.82-g sample of solid potassium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 22.7 °C to 59.2 °C. What is ÎH for the dissolution of KOH in water, as shown below?

KOH(s) K+(aq) + OH(aq)

Assume that all solutions have the same specific heat as water.

119 kJ/mol

1.19 x 103 kJ/mol

16.5 kJ/mol

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