Chapter 8, Problem 8.113P

Interpretation Introduction

(a)

Interpretation:

The mass fraction of ${\text{NH}}_3$ in the vapor phase and the corresponding system temperature are to be determined.

Concept introduction:

For two component system in vapor liquid equilibrium, enthalpy-concentration charts are very useful to get the mass fraction of the components at a particular temperature and pressure.

Interpretation Introduction

(b)

Interpretation:

The overall system composition and specific enthalpy of the system are to be determined.

Concept introduction:

In a system, a conserved quantity (total mass, mass of a particular species, energy or momentum) is balanced and can be written as:

$input+generation-output-consumpumtion=accumulation$

Here, ‘ input’ is the stream which enters the system. ‘ generation’ is the term used for the quantity that is produced within the system. ‘ output’ is the stream which leaves the system. ‘ consumption’ is the term used for the quantity that is consumed within the system. ‘ accumulation’ is used for the quantity which is builds up within the system.

All the equations which are formed are then solved simultaneously to calculate the values of the unknown variables.

The specific enthalpy of the system is:

$\hat{H}=\sum _i{m}_i{\hat{H}}_i$   (1)

Here, $m_i$ is the mass of the phase $i$ and ${\hat{H}}_i$ is the specific enthalpy of that phase in the system.