Chapter 9, Problem 43E

Interpretation Introduction

Interpretation:Theworking of calorimeter to calculate $\Delta \text{H}$ and $\Delta \text{E}$ and change in temperature for an endothermic/exothermic reaction needs to be explained. The reason of calculation of $\Delta \text{H}$ from coffee cup calorimeter whereas $\Delta \text{E}$ is obtained from a bomb calorimeter needs to be explained.

Concept Introduction:At constant volume the change in heat for a system to change the internal energy is represented as ΔE or q_V. At constant pressure, the change in heat for a system to change the enthalpy is represented as ΔH or q_p.

Specific heat the energy requires to raise the temperature by 1°C for 1 g of the substance. The heat change can be calculated with the help of specific heat capacity as given below:

  ${\text{q = m × C × (T}}_{\text{f}}{\text{ - T}}_{\text{i}}\text{)}$