wiz-icon
MyQuestionIcon
MyQuestionIcon
15
You visited us 15 times! Enjoying our articles? Unlock Full Access!
Question

At some temperature and under a pressure of 4 atm, PCl5 is 10% dissociated. Calculated the pressure at which PCl5 will be 20% dissociated temperature remaining same.

A
0.96 atm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
0.68 atm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
0.54 atm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
0.81 atm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A 0.96 atm
Let initially 100 moles were present and after 10% dissociation at equilibrium only 90% are remaining.
At 4 atm pressure and 10% dissociation.
PCl5PCl3+ Cl2Equibm mole901010Equilibrium partial pressures90110×410110×410110×4
Hence, Kp=PPCl5PPCl5PPCl5=499
At 20 % dissociation,
PCl5PCl3+ Cl2Equilibrium mole802020Equilibrium partial pressures80120×P20120×P20120×PKp=PPCl3PCl2PPCl5=124×P
Thus, 124×P=499 or P=0.96 atm

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon