Question

Calculate the relative lowering in vapour pressure if 100 g of a nonvolatile solute (mol.wt.100) is dissolved in 432 g water.(If your answer is $x$, then write $x\times 100$).

Answer 1

When relative lowering is expressed in terms of solute and solvent then formula is $\frac{n}{n+N}$
Where
n= moles of solute
N=moles of solvent
here,
$\frac{\frac{100}{100}}{\frac{100}{100}+\frac{432}{18}}$
(mol wt. of water is 18)
So,
Ans-0.04