[填空题]
(a) What is the average transw loev4). 7x. g0rclvalational x a1/,g0dmc 0.kccg mwkinetic energy of an oxygen molecule at STP? m0xc1cd ck,maw.0 g g/ $ \times10^{-21 }$ J
(b) What is the total translational kinetic energy of 2.0 mol of $O_2$ molecules at 20 $^{\circ} $ C? $ \times10^{3 }$ J