Which one of the following will have greatest average speed of its mol

1.	Which one of the following will have greatest average speed of its molecules ?
Answer» 0.5 mol of `O_(2)` at 500 K 0.2 mol of `CO_(2)` at 400 K 1.0 mol of He at 200 K 0.4 mol of `NH_(3)` at 300 K Solution :AVERAGE speed `=sqrt((8RT)/(piM))`. Thus, GREATER the value of `sqrt((T)/(M))`, greater is the average speed. These VALUES are : `O_(2)=sqrt((500)/(2))=3.95,CO_(2)=sqrt((400)/(44))=3.0` `He=sqrt((200)/(4))=7.0, NH_(3)=sqrt((300)/(17))=4.2` Thus, He at 200 K will have highest average speed.

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