Home
Class 12
CHEMISTRY
The boiling point of a solution made by ...

The boiling point of a solution made by dissolving `12.0 g` of glucose in `100 g` of water is `100.34^(@)C`. Calculate the molecular weight of glucose, `K_(b)` for water `= 0.52^(@)C//m`.

Text Solution

Verified by Experts

Using the relation for the molecular weight of a solute from elevation in boiling point, we have
`Mw_(b) = K_(b)(W_(B)/(W_(A)DeltaT_(b)) xx 1000)`
`= 0.52 (12/(100 xx 0.34) xx 1000)`
`(DeltaT_(b) = 100.34 - 100 = 0.34^(@)C)`
`rArr Mw_(B) = 183.5 g mol^(-1)`
Promotional Banner

Similar Questions

Explore conceptually related problems

The molality of a solution containing 0.1 mol of a substance in 100g of water is :

Calculate the molality of a solution by dissolving 0.850g of ammonia ( NH_3 ) in 100g of water.

The boiling point of 0.1 M KCl solution is ………..than 100^(@)C .

What is the boiling point of an aqueous solution containing 0.6g of urea in 100g of water? Kb for water is 0.52 K kg mol^(-1) .

The boiling point of a solution containing 2.62 g of a substance A in 100 g of water is higher by 0.0512^(@)C than the boiling point of pure water. The molar mass of the substance ( K_(b)=5.12Km^(-1) ) is :

A solution of sucrose (molar mass =342) is prepared by dissolving 68.4 g in 1000 g of water. Calculate The boiling point of solution.

1.355 g of a substance dissolved in 55 g of CH_(3)COOH produced a depression in the freezing point of 0.618^(@)C . Calculate the molecular weight of the substance (K_(f)=3.85)

10g of an organic substance when dissolved in two litres of water gave an osmotic pressure of 0.59 atm, at 7^(@)C . Calculate the molecular weight of the substance.