Chapter 8, Problem 8.111P

Interpretation Introduction

(a)

Interpretation:

What mass of 80% solution should be weighed out.

Concept introduction:

The energy is transferred from higher temperature body to the lower temperature body.

For enthalpy balance of in and out from the process as follows:

$\Delta H=\sum _{out}{n}_i{H}_i-\sum _{in}{n}_i{H}_i$

Where, n = moles and H = enthalpy.

Interpretation Introduction

(b)

Interpretation:

Estimate the product solution temperature.

Concept introduction:

The energy is transferred from higher temperature body to the lower temperature body.

For enthalpy balance of in and out from the process as follows:

$\Delta H=\sum _{out}{n}_i{H}_i-\sum _{in}{n}_i{H}_i$

Where, n = moles and H = enthalpy

Interpretation Introduction

(c)

Interpretation:

Calculate the heat transferred from the solution to the laboratory air.

Concept introduction:

The energy is transferred from higher temperature body to the lower temperature body.

For enthalpy balance of in and out from the process as follows:

$\Delta H=\sum _{out}{n}_i{H}_i-\sum _{in}{n}_i{H}_i$

Where, n = moles and H = enthalpy

Interpretation Introduction

(d)

Interpretation:

For the given process which procedure would be safer.

Concept introduction:

The energy is transferred from higher temperature body to the lower temperature body.

For enthalpy balance of in and out from the process as follows:

$\Delta H=\sum _{out}{n}_i{H}_i-\sum _{in}{n}_i{H}_i$

Where, n = moles and H = enthalpy