Question

A solution containing 0.45g of urea in 22.50g of water gave a boiling point elevation of 0.17K. Calculate the molal boiling point elevation constant for water. ​

Answer 1

please mark me brainliest and follow me

The answer is: 0.51 K Kg mol⁻¹

The calculation for the question is:

Molar mass of NH₂CONH₂ (urea) = 60

We need to find Kb,

ΔTb = 0.17 K

Formula of ΔTb = $\frac{K_b x W_b}{W_AxM_B}$

by re- arranging the formula, we get

Kb = (ΔTb x Wa x Mb) / Wb

Kb = $\frac{0.17x0.0225x60}{0.45}$ = 0.51 K Kg mol⁻¹