Home
Class 12
CHEMISTRY
A solution weighing a g has molality b. ...

A solution weighing `a` g has molality `b`. The molecular mass of solute if the mass of solute is c g, will be:

A

`c/bxx1000/((a-c))`

B

`b/axx1000/((a-b))`

C

`b/cxx1000/((a-c))`

D

`c/axx1000/((b-a))`

Text Solution

Verified by Experts

Molality `m =(W_(B))/(m_(B))xx1000/(w_(A))impliesb=c/(m_(B))xx1000/((a-c)), m_(B)=c/bxx1000/((a-c))`
Promotional Banner

Similar Questions

Explore conceptually related problems

when 1.80 g of a nonvolatile solute is dissolved in 90 g of benzene, the boiling point is raised to 354.11K . If the boiling point of benzene is 353.23K and K_(b) for benzene is 2.53 KKg mol^(-1) , calculate the molecular mass of the solute. Strategy: From the boiling point of the solution, calculate the boiling point elevation, DeltaT_(b) , then solve the equation DeltaT_(b)=K_(b)m for the molality m . Molality equals moles of solute divided by kilograms of solvent (benzene). By substituting values for molality and kilograms C_(6)H_(6) , we can solve for moles of solute. The molar mass of solute equals mass of solute (1.80 g) divided by moles of solute. The molecular mass (in amu) has the same numerical value as molar mass in g mol^(-1) .

A solution of urea contains 8.6 g per litre. It is isotonic with 5% solution of a non-volatile solute. The molecular mass of the solute will be :

An aqueous solution containing 6 g of urea in 500 mL of solution has a density equal to 1.05. If the molar mass of urea is 60, then the molality of solution is :

A solution containing 10 g per dm^(3) of urea (mol.wt. = 60 g mol^(-1) ) is isotonic with a 5% ( mass//vol.) of a non-volatile solute. The molecular mass of non-volatile solute is:

The density of 2.0 M solution of a solute is 1.2 g mL^(-1) . If the molecular mass of the solute is 100 g mol^(-1) , then the molality of the solution is

A 100g NaOH solution has 20g NaOH . Find molality .

A solution containing 10 g per dm^(3) of urea (molecular mass = 60 g mol^(–1) ) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solution is:

The vapour pressure of ether at 20^(@)C is 442 mm. When 7.2 g of a solute is dissolved in 60 g ether, vapour pressure is lowered by 32 units. If molecular mass of ether is 74 then molecular mass of solute is:

The vapour pressure of ether at 20^(@)C is 442 mm. When 7.2 g of a solute is dissolved in 60 g ether, vapour pressure is lowered by 32 units. If molecular mass of ether is 74 then molecular mass of solute is: