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 atmL2mol−2)? (Use R=0.08LatmK−1 mol−1)

A
0.081
B
0.81
C
8.1
D
1.23

Solution

## The correct option is D 0.81Using formula, PcM=ρcRTc ⇒a27b2×44=0.55×R×8a27Rb ⇒b=440.55×8=10 cm3 mol−1 Also, Tc=8a27Rb=300 K ⇒a=300×27×0.08×0.018 ⇒a=0.81 atm L2mol−2Co-Curriculars

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