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Mahesh Kumar KapilLecturer in Chemistry
GMSSS-23A ChandigarhMob No. 9501477200
Mahesh
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BOYLE’S LAW
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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
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RATIO OF MOLECULAR SPEEDS
1 : 1.128 : 1.224
PLEASE NOTE*R=K when m=M
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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.
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LIQUEFACTION OF GASES
Andrew’s Experiments
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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
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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
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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.