7/26/2019 7.02-States of Matter-2 PU

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States of Matter -2(KTG & Liquid State) - 7.02

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PU-11

Homework Questions

1. Explain the physical significance of van der Waals constants

2. 56 g of N2is contained to a lit flask at 37oC. Calculate its pressure using van der Waals equation,

2 24.17a atmlit mol

10.037b lit mol

3.

What are the units of vander Waals constant a and b ?

4. What is Excluded volume and what is the value of b ?

5. What is the value of Pressure correction?

Solutions

1. The van der Waals constant a is the measure of the magnitude of the intermolecular forces of

attraction while b is a measure of the effective site of the gas molecules

2.

562

28

Wn moles

MW

Now, 2

2

anP V nb nRT

V

2

2

nRT anP

V nb V

2

2

2 0.0821 310 4.17 28.12

6 2 0.037 6

P atm

P = 8.12 atm

3. Unit of 2 2atm litre mola

Unit of 1litre molb

4. For definition read notes: 34

43

Ab N r

4 Volume of individual molecule AN

5.2

2

an

V