CH-1271
Energy profile diagrams
Chemistry · Secondary 4 · Medium · Energy profile diagrams
A student dissolves 3.0 g of lithium chloride in excess water. The temperature change of the solution is −2.8 °C and the calculated energy change is +840 J. Using these results, what is the enthalpy change, in kJ/mol, for dissolving lithium chloride?
(Relative formula mass of LiCl = 42.5)
(Relative formula mass of LiCl = 42.5)
- +11.9 kJ/mol
- −11.9 kJ/mol
- +0.119 kJ/mol
- +28.3 kJ/mol
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