Home
Class 12
CHEMISTRY
If 8g of a non-electrolyte solute is dis...

If 8g of a non-electrolyte solute is dissolved in 114g of n-octane to educe its vapour pressure to `80%`, the molar mass of the solute is [ given molar mass of n-octane is 114g `mol^(-1)`]

A

60

B

80

C

20

D

40

Text Solution

Verified by Experts

The correct Answer is:
D
Assuming dilute solution
`(DeltaP)/(P_(A)^(B)) =(n_(B))/(n_(A)) = (w_(B))/(m_(B)) . (m_(A))/(w_(A))`
`20/100 = 8/(m_(B)) . (114)/(114)`
`m_(n) = (8xx 100)/20 = 40 " g mol"^(-1)`
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    PHYSICS WALLAH|Exercise LEVEL-2|31 Videos

  • REDOX REACTIONS

    PHYSICS WALLAH|Exercise LEVEL-1|40 Videos

  • STATES OF MATTER

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |14 Videos

Similar Questions

Explore conceptually related problems

The mass of a non-volatile solute (Molar mass 40) which should be dissolved in 114g octance to reduce its vapour pressure to 80% is 2xg . Find the value of x

Calculate the mass of a non-volatile solute ( molecular mass 40 ) which should be dissolved in 114 g octane to reduce its vapour pressure to 80% .

The weight of a non-volatile solute (molecular weight = 40), which should be dissolved in 114g octane to reduce its vapour pressure to 80% is ___________ .