Question

25 g of an aqueous solution contains 15g of

urea. What is the conc. of the solution in terms

of molality (m) ( molecular mass of urea is 60 g

mol–1)​

Answer 1

Answer:

10 m

Explanation:

molality (m) = no.of moles / mass of solution in kg

moles = given mass / molar mass

so,, moles of urea= 15g/ 60g

= 1/4 mol

mass of solution in kg= 25g/ 1000

1/ 40kg

so,, m = n/ mass (kg)

= (1/4) /(1/40)

= 40/ 4

= 10 m