Test Index

JAMB Chemistry 2020 Paper

Question : 25

Total: 40

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Solution:

Concept:

Heat of solution is the heat change when one mole of solute dissolves completely in a solvent.

Explanation:

The solute is anhydrous copper(II) tetraoxosulphate(VI),

\mathrm{CuSO}_4

The molar mass of

\mathrm{CuSO}_4

160\text{ g mol}^{-1}

Mass dissolved is

32\text{ g}

Number of moles dissolved:

n = \frac{32}{160} = 0.2\text{ mol}

This

0.2\text{ mol}

releases

13.0\text{ kJ}

of heat.

Heat of solution for

1\text{ mol}

\frac{13.0\text{ kJ}}{0.2\text{ mol}} = 65.0\text{ kJ mol}^{-1}

Answer:

65.0\text{ kJ/mol}

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