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Question

For carbon dioxide, critical density is 0.55 g/cc and its Tc=300 K. What is the value of Van der Waals' constant a (in atmL2mol2)?
(Use R=0.08LatmK1 mol1)


A
0.081
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B
0.81
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C
8.1
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D
1.23
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Solution

The correct option is D 0.81
Using formula, PcM=ρcRTc
a27b2×44=0.55×R×8a27Rb
b=440.55×8=10 cm3 mol1

Also, Tc=8a27Rb=300 K

a=300×27×0.08×0.018
a=0.81 atm L2mol2

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