[填空题]
(a) What is the average trazqpn lm55p8apyq.6w 3lv jx*yq;.jl h10q8cq nsv5dc kcf( 4)(t jq1h3+esxvr ylational kinetic energy of an oxygen molecule at STP?xjhvq )4+dcfk5s3( ct ev yr(1 $ \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