8. The standard enthalpy of formation of RbF (s) is - 557.7kJ/mol and the standard enthalpy of formation of RbF (aq, 1 m) is - 583.8 kJ/mol. Determine the enthalpy of solution of RbF and indicate whether the solution temperature will increase or decrease when RbF is dissolved in water.

Question

Chemistry

Elsa Holder

13 December, 04:57

8. The standard enthalpy of formation of RbF (s) is - 557.7kJ/mol and the standard enthalpy of formation of RbF (aq, 1 m) is - 583.8 kJ/mol. Determine the enthalpy of solution of RbF and indicate whether the solution temperature will increase or decrease when RbF is dissolved in water.

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Mclean · Answer 1

Given

The enthalpy of formation of RbF (s) is - 557.7kJ/mol

The standard enthalpy of formation of RbF (aq, 1 m) is - 583.8 kJ/mol

The enthalpy of solution of RbF = Enthalpy of RbF (aq) - Enthalpy of formation of RbF (s)

= - 583.8 - (-557.7) kJ/mol

= - 26.1 kJ/mol

The enthalpy is negative which means that the temperature will rise when RbF is dissolved.