Home
Class 12
CHEMISTRY
The mass of non-volatile, non-electrolyt...

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

A

37.5g

B

75g

C

150 g

D

50 g

Text Solution

Verified by Experts

The correct Answer is:
C

Molar mass of octane = 144 g/mol
From the lowering vapour pressure we have,
`(DeltaP)/P =((W_2)/(M_2))/(W_2/M_2 + W_1/M_1) `
`75/100 = (W_2/(50g//mol))/(w_2/(50g//mol)+(114g)/(114 g//mol))`
`0.75 = (W_2/50)/(W_2/50 + 1)`
`W_2/50 +1 = W_2/(50xx0.75)`
`W_2 = 150g`
Note : `W_2 and M_2` are mass and molar mass of solute and `W_1 and M_1` are mass and molar mass of octane.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • REDOX REACTIONS

    DISHA PUBLICATION|Exercise EXERCISE-2 : CONCEPT APPLICATOR|30 Videos
  • SOME BASIC CONCEPTS OF CHEMISTRY

    DISHA PUBLICATION|Exercise Exercise|114 Videos

Similar Questions

Explore conceptually related problems

Calculate the mass of a non-volatile solute (molar mass 40 g "mol"^(-1) ] which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

Calculate the mass of a non-volatile solute (molar mass "40 g mol"^(-1) ) which should be dissolved in 114 g octane to reduce its vapour pressure to 80% .

Knowledge Check

  • What will be the mass of a non-volatile solute ( Molar mass = 40 g mol ^(-1)) Which should be dissolved in 114 g octane to reduce its vapour pressure to 80 %

    A
    10 g
    B
    4 g
    C
    2 g
    D
    16 g
  • The mass of a non-volatile solute of molar mass 40g" "mol^(-1) that should be dissolved in 114 g of octane to lower its vapour pressure by 20% is

    A
    `11.4g`
    B
    `9.8g`
    C
    `12.8g`
    D
    10g
  • Calculate the weight of non - volatile solute having molecular weight 40, which should be dissolvd in 57 gm octane to reduce its vapour pressure to 80% :

    A
    `47.2g`
    B
    `5g`
    C
    `106.2g`
    D
    None of these
  • Similar Questions

    Explore conceptually related problems

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

    The mass of a non-volatile solute of molar mass 40 g mol^(-1) that should be dissolved in 114 g of octane to lower its vapour pressure by 20% is

    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 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

    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 ___________ .