A piece of cauliflower was combusted in a calorimeter with a heat capacity of 5.24 kJ/°C. The temperature increased from 24.35°C to 25.07°C. What was the enthalpy change for the combustion of the cauliflower? (C = 75.291 J/mol.K for H₂O; q = C_cal$\Delta$T)

Question

Quizplus · Accepted Answer

The enthalpy change for the combustion of the cauliflower can be calculated using the formula q = C$\Delta$T, where C is the heat capacity of the calorimeter and $\Delta$T is the change in temperature. Given C = 5.24 kJ/°C and $\Delta$T = 25.07°C - 24.35°C = 0.72°C, q = 5.24 kJ/°C * 0.72°C = 3.7728 kJ. Since the combustion of cauliflower releases heat, the enthalpy change is negative, making the correct answer -3.8 kJ, rounded to one decimal place.

A Piece of Cauliflower Was Combusted in a Calorimeter with a Heat