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)`
Doubtnut Promotions Banner Mobile Dark
|

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% .

Knowledge Check

  • The vapour pressure of acetone at 20^(@) C is 185 torr when 1.2 g of a non - volattile substance was dissolved in 100 g of acetone at 20^(@) C ,its vapour pressure was 183 torr . The molar mass ( g mol ^(-1) ) of the substance . is molar mass ( g mol ^(-1)) of the substance is ______.

    A
    `32`
    B
    `64`
    C
    `128`
    D
    `488`

  • 8g is dissolved in 1L of solution its molarity is

    A
    0.2 M
    B
    0.4 M
    C
    0.04 M
    D
    0.8 M

  • 8g is dissolved in 1L of solution its molarity is

    A
    0.2M
    B
    0.4M
    C
    0.04 M
    D
    0.8 M

    • Similar Questions

    Explore conceptually related problems

    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 ___________ .

    The vapour pressure of acetone at 20^@C is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20^@C , its vapour pressure was 183 torr. The molar mass (g "mol"^(-) ) of the substance is:

    The vapour pressure of acetone at 20^(@)C is 185 torr. When 1.2 g of a non-volatile was dissolved in 100 g of acetone at 20^(@)C , its vapour pressure was 183 torr. The molar mass ( "g mol"^(-1) ) of the substance is

    The mass of non-volatile, non-elctrolyte solute (molar mass = 50 g mol^(-1) ) needed to be dissolved in 114 g octane to reduce its vapour pressure to 75%, is

    The vapour pressure of acetone at 20^(@)C is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20^(@)C , its vapour pressure was 183 torr. The molar mass of the substance is :

    Home
    Profile