Mahesh Mahesh Kumar Kapil Lecturer in Chemistry GMSSS-23A

Mahesh Mahesh Kumar Kapil Lecturer in Chemistry

GMSSS-23A Chandigarh Mob No. 9501477200 BOYLES LAW

MOLAR VOLUME OF GAS UNDER DIFF. CONDITIONS: 1. When STP is taken as 273K and 1atm the

molar volume is 22.4L 2. When STP is taken as 273K and 1bar the molar volume is 22.7L (1 Bar=0.987atm) 3. When SATP conditions are used i.e. 298K and

1bar the molar volume is 24.8L RATIO OF MOLECULAR SPEEDS

1 :

1.128 :

1.224 PLEASE NOTE *R=K when m=M

SIGNIFICANCE OF VAN DER WAALS CONSTANTS

The value of constant a is measure of magnitude of attractive forces among the molecules of the gas. Its units are

atm litre2/mole2 The value of constant b is measure of the effective size of the molecules of the gas. Its units are litre/mole.

LIQUEFACTION OF GASES Andrews Experiments

Q1) 28gm of each of the following gases are taken at 300K and 600mm pressure .Which of these will have least volume?

A)HBr B)HCl

C)HF D)HI Q2) By what factor does the avg. velocity of a gaseous

molecule inc. when absolute temperature is doubled.

A)1.4

B)2 C)2.8 D)4

Q3) Dipole-induced dipole interactions are present in which of the following pairs?

A)Water and Alcohol B)Chlorine and Carbon Tetrachloride C)Hydrogen Chloride and Helium D)Silicon Tetra fluoride and Helium.

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