Chapter 9, Problem 2QAP

(a)

Interpretation Introduction

Interpretation:

The pressure of the vapors of benzene is to be calculated under the given conditions.

Concept Introduction :

The ideal gas equation is the expression that relates different measurable properties of a gas. The expression is given as:

  $PV=nRT$

where,

P = Pressure of the gas

V = Volume of the container in which the gas is occupied

R = Ideal gas constant = 0.0821 L atm/ mol K

n = number of moles of the gas = Mass of gas / Molecular mass of gas

T = Absolute temperature of the gas i.e., temperature on Kelvin scale

(b)

Interpretation Introduction

Interpretation:

The pressure calculated in part (a) are to be compared with the equilibrium pressures of benzene.

Concept Introduction :

If the pressure of vapors is more than the equilibrium pressure, it indicates that the liquid has undergone condensation.

(c)

Interpretation Introduction

Interpretation:

The pressure of benzene vapors inside the flask is to be calculated at 50 ⁰C and 60 ⁰C.

Concept Introduction : When a liquid is present in a closed container, it starts to form vapors above the liquid surface. A stage is reached when the liquid and vapors are present in equilibrium with each other.