Chapter 6, Problem 6.31P

(a)

Interpretation Introduction

Interpretation: Whether the heat flow from Cu to Fe or Fe to Cu.

Concept Introduction: Enthalpy is the total kinetic and potential energy of a system at a constant pressure.

(b)

Interpretation Introduction

Interpretation: To identify the other information that is needed to correct any measurements is an actual experiment.

Concept Introduction: Change in temperature is determined by $\Delta \text{T}$ .

  $\Delta \text{T}{\text{=T}}_{\text{2}}-{\text{T}}_{\text{1}}$

  $\begin{array}{l}{\text{T}}_{\text{2}}=\text{Final}\text{temperature}\\ {\text{T}}_{\text{1}}=\text{Initial}\text{temperature}\end{array}$

(c)

Interpretation Introduction

Interpretation: To calculate the maximum final temperature of the system.

Concept Introduction: Relationship between heat and temperature change is as follows:

  $q=cm\Delta T$

Here q is heat, c is specific heat of the sample, m is mass of the sample

  $\Delta \text{T}$ is temperature change in temperature $\left({\text{T}}_{\text{2}}-{\text{T}}_{\text{1}}\right)$ .

Also, $\text{J}\cdot {\text{g}}^{-1}{\text{K}}^{-1}=\text{J}\cdot {\text{g}}^{-1}°\text{C}$