Answer:6.07 x 10^-21 J
Explanation:Substituting the given values into the formula, we get: Average kinetic energy = (3/2) (1.38 x 10^-23 J/K) (293.15 K) = 6.07 x 10^-21 J So, the average kinetic energy per molecule of the helium gas is approximately 6.1 x 10^-21 J. Answer Therefore, the correct answer is 6.1 × 10 − 21 J.