Chapter 6, Problem 54AP

(a)

Interpretation Introduction

Interpretation:

Flask having most atoms of gas should be identified.

Concept introduction:

Number of atom is related to molar mass as follows:

Number of atoms /N_A = n =

Where, m = given mass

M = molar mass

The above relation indicates, higher the molar mass of compound lower will be the number of atoms.

(b)

Interpretation Introduction

Interpretation:

Gas with greatest density should be identified.

Concept introduction:

Compound with higher molar mass having the higher density moreover, the heavier compound having bulkiness due to which their boiling point is quite higher along with density.

The density is related to molar mass as follows:

(c)

Interpretation Introduction

Interpretation:

Pressure in flask X and in flask Z should be identified.

Concept introduction:

Pressure and density are related to each other as follows:

Where, d is density

P is pressure.

(d)

Interpretation Introduction

Interpretation:

The number of molecules in flask X and in flask Z should be identified.

Concept introduction:

On lowering the temperature, the volume of compound also decreases and volume is directly related to number of moles which results in lowering of the number of moles as well whereas on increasing the temperature, number of molecules increases.