At room temperature following traction goes to completion `2AB(g)+B_(2)(g)rarr2AB_(2)(s)` `AB_(2)` is solid with negligble vapour pressure below `0^(@)C`. At 300 K, the AB in the smaller flask exerts a pressure of 3 atm and in the larger flask `B_(2)` exerts a pressure of 1 atm at 400 K when they are separated out by a close valve, The gases are mixed by opening the stop cock and after the end of the reaction the flask are cooled to 250 K The final pressure is :A. 0.156 atmB. 0.3125 atmC. 0.625 atmD. 3.2 atm

At room temperature following traction goes to completion `2AB(g)+B_(2

1.	At room temperature following traction goes to completion `2AB(g)+B_(2)(g)rarr2AB_(2)(s)` `AB_(2)` is solid with negligble vapour pressure below `0^(@)C`. At 300 K, the AB in the smaller flask exerts a pressure of 3 atm and in the larger flask `B_(2)` exerts a pressure of 1 atm at 400 K when they are separated out by a close valve, The gases are mixed by opening the stop cock and after the end of the reaction the flask are cooled to 250 K The final pressure is :A. 0.156 atmB. 0.3125 atmC. 0.625 atmD. 3.2 atm
Answer» Correct Answer - c (c) `n_(AB)=(3xx8.21)/(0.0821xx300)=1,` `n_(B_(2))=(1xx8.21)/(0.0821xx400)=0.25` `2AB(g)+B_(2)(g)rarr2AB_(2)(s)` `{:("Initial moles",1,0.25),("After reaction",0.5,0):}` `P_(AB)xx(8.21+8.21)=0.5xx0.0821xx250` `P_(AB)=0.625atm`

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