QuestionThermochemistry / ΔH and ΔU
In a porcelain dish exposed to air at 27°C, 1·22 g of benzoic acid is burned, releasing 31,700 J of heat. The enthalpy change (ΔH) and internal energy change (ΔU) for the process are, respectively (Given : Molar mass of benzoic acid is 122 g mol⁻¹)
- (a) −31,688 J and −31,700 J
- (b) −31,700 J and −30,453 J
- (c) −31,700 J and −31,637 J
- (d) −31,700 J and −31,688 J
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