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A 9.07-g sample of NaOH is dissolved in 104.9 g of water in a coffee cup...

A 9.07-g sample of NaOH is dissolved in 104.9 g of water in a coffee cup calorimeter. The temperature of the solution rises from 15.49°C to 23.76°C. Calculate ∆Hrxn, in kJ for the dissociation of NaOH in water Assume that the heat capacity for the solution is 4.18 J/g°C.
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