Calculate the average kinetic energy per molecule, in joules, for O₂(g) at 298 K and 1.00 atm.

a) 4.2 × 10⁻²¹ J
b) 5.8 × 10⁻²¹ J
c) 6.7 × 10⁻²¹ J
d) 7.9 × 10⁻²¹ J