Question

If the molecules of a gas are spherical of radius $1.0$ Angstrom, the van der Waal's constant b of the gas is:

• A. $0.0025$ L/mol
• B. $0.0101$ L/mol
• C. $0.0371$ L/mol
• D. $0.0224$ L/mol

Answer 1

Answer: (A)

$0.0025$ L/mol

b = 4× Volume occupied by the molecules in one mole of gas.

$=4\times N\times \left(\frac{4}{3}\pi r^3\right)$

$=4\times \frac{4}{3}\pi {10}^{-30}=0.0025L/mol$