Problem: Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. Part AHow much potassium nitrate has to dissolve in water to absorb 113 kJ of heat? Express your answer using two significant figures.

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Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. 

Part A

How much potassium nitrate has to dissolve in water to absorb 113 kJ of heat? 

Express your answer using two significant figures.