CH-1238
Exothermic and endothermic reactions
Chemistry · Secondary 4 · Medium · Exothermic and endothermic reactions
5.0 g of potassium bromide is dissolved in excess water. The temperature of the solution increases from 20.0 °C to 23.0 °C and the energy change is calculated as −900 J. What is the enthalpy change, in kJ/mol, for dissolving potassium bromide? (Molar mass of KBr = 119 g/mol)
- −21.4 kJ/mol
- −0.214 kJ/mol
- −214 kJ/mol
- +21.4 kJ/mol
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