Home
Class 12
CHEMISTRY
The vapour pressure of pure benzene at a...

The vapour pressure of pure benzene at a certain temperature is `640 mm Hg`. A non-volatile solid weighing `2.175g` is added to `39.0g` of benzene. The vapour pressure of the solution is `600mm Hg`. What is the molar mass of the solid substance?

Text Solution

Verified by Experts

The correct Answer is:
65.25
According to Raoult.s law
`(P_(0)-P)/P^(@) = (w//m)/(w//m + W//M)`
Here, `P^(@) = 640 mm Hg, P= 600 mm Hg, w=2.175 g`
W= 39.0g M=78, m = Molecular weight of solute
Substituting the various values in the above equation `=(640-600)/640 = (2.175//m)/(2.175//m + 39//78)`
m = 65. 25 g
Promotional Banner

Topper's Solved these Questions

  • CHAPTERWISE NUMERIC/INTEGER ANSWER QUESTIONS

    DISHA PUBLICATION|Exercise CHAPTER-17 ELECTROCHEMISTRY|15 Videos

  • CHAPTERWISE NUMERIC/INTEGER ANSWER QUESTIONS

    DISHA PUBLICATION|Exercise CHAPTER-18 CHEMICAL KINETICS|15 Videos

  • CHAPTERWISE NUMERIC/INTEGER ANSWER QUESTIONS

    DISHA PUBLICATION|Exercise CHAPTER-15 THE SOLID STATE|15 Videos

  • BIOMOLECULES

    DISHA PUBLICATION|Exercise Exercise - 2 : Concept Applicator|30 Videos

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    DISHA PUBLICATION|Exercise EXERCISE-2: CONCEPT APPLICATOR|30 Videos

Similar Questions

Explore conceptually related problems

The vapor pressure of pure benzene at a certain temperature is 640 mmHg . A nonvolatile nonelectrolyte solid weighing 2.0 g is added to 39 g of benzene. The vapor pressure of the solution is 600 mmHg . What is the molecular mass of the solid substance. Strategy: Use Equation (2.58) as the concept of colligative properties is based on dilute solution. The moleculsr mass of benzene is 78u .

The vapour pressure of benzene at a certain temperature is 640 mm Hg . A non-volatile and non-electrolyte soild weighing 2.175 g is added to 39.08 g of benzene. If the vapour pressure of the solution is 6 mmHg . What is the molecular mass of solid substance?

The vapour pressure of pure benzene at a certain temperature is 640 mm og Hg . A non-volatile non-electrolyte solid weighing 2.175 g added 39.0 g of benzene. The vapour pressure of the solution is 600 mm of Hg . What is the molecular weight of solid substance?

The vapour pressure of pure benzene at a certain temperature is 640 mm of Hg. A non volatile nonelectrolyte solid weight 0.175 g is added to 39.0 benzene. The Vapour pressure of the solution is 600 mm of Hg. What is molecular weight of solid substance?

The vapour pressure of benzene at a certain temperature is 640 mm of Hg A non-volatile and non-electrolyte solid weighing 2.175g is added to 39.08g of benzene .the vapour pressure of the solution is 600 mm of Hg. What is the molecular weight of solid substance ?