CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The vapour density of PCl5 is 104.16 but when heated to 230oC, its vapour density is reduced to 62. The degree of dissociation of PCl5, at 230oC, is:

A
0.34
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
0.68
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
0.80
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
None of these
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 0.68
The vapour density of PCl5 is 104.16 but when heated to 230oC, its vapour density is reduced to 62. The degree of dissociation of PCl5
, at 230oC is 0.68
The molecular weight is twice the vapour density.
When the vapor density is 104.16, the molecular weight is 2×104.16=208.32 g/mol.
When the vapor density is 62, the molecular weight is 2×64=124 g/mol
Let x be the degree of dissociation of PCl5
PCl5
PCl3
Cl2
Initial moles
10
0
Equilibrium moles
1xx
x
208.32(1x)+137.33x+71x1x+x+x=124
208.321+x=124
208.32=124+124x
84.32=124x
x=0.68
Hence, the degree of dissociation of PCl5 is 0.68.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Oxidation States
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon