Chapter 4, Problem 4.15NP

Interpretation Introduction

Interpretation:

The calorimeter constant needs to be determined for the given process.

Concept Introduction:

The standard internal energy change for a reaction ${\text{ΔU}}_{\text{R}}^{\text{0}}$ is given in terms of the standard enthalpy change ${\text{ΔH}}_{\text{R}}^{\text{0}}$ as:

  ${\text{ΔU}}_{\text{R}}^{\text{0}}\text{ = }\Delta {\text{H}}_{\text{R}}^{\text{0}}-\Delta \text{nRT ------(1)}$

Here, Δn = change in the number of moles of gaseous products and reactants

R = gas constant

T = temperature

Chemical reactions in general involve exchange of heat between the system (reactants and products) and the surroundings. The heat (q) absorbed or evolved is given as: $\text{q = m ×c×ΔT ------(2)}$

Here, m and c are the mass and specific heat capacity of the substance

ΔT = change in temperature