Correct option is (b) 6.17 x 10-21 J
The average kinetic energy of an ideal gas per molecule in SI units at 25∘C will be 6.17 × 10−21 J
The average kinetic energy of an ideal gas per molecule is given by the expression
Average kinetic energy = \(\frac 32\)kT
Here, k is boltzmann constant and T is absolute temperature.
k = 1.36 × 10-23 J/K
T = 25 + 273 = 298K
Average kinetic energy = \(\frac 32 \times 1.36 \times 10^{-23} J/K \times 298 K = 6.17 \times 10^{-21} J\)
