Question

The standard enthalpy of formation of NaOH(s) is -425.9 kJ/mol and the standard enthalpy of formation of NaOH(aq, 1 m) is -469.2 kJ/mol. Determine the heat of solution of NaOH. Will the solution temperature increase or decrease when NaOH is dissolved in water?
A.-43.3 kJ/mol; increase
B.+43.3 kJ/mol; increase
C.-43.3 kJ/mol; decrease
D.+895.1 kJ/mol; increase
E.-895.1 kJ/mol; decrease

Answer

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