Question

calculate the molar mass of a substance 1g of which when dissolved in 100g of water gave a solution boiling point at 100.1celsius at a pressure of 1atm​

Answer 1

Dear Student,

● Answer -

Molar mass of solute = 51.2 g

● Explanation -

# Given -

W1 = 100 g

W2 = 1 g

T = 100.1 °C

P = 1 atm

# Solution -

Elevation in boiling point is calculated as -

∆T = Kb × m

T - T0 = Kb × W2 × 1000 / (W1 × M2)

M2 = Kb × W2 × 1000 / [(T - T0) × W1]

M2 = 0.512 × 1 × 1000 / [(100.1 - 100) × 100]

M2 = 512 / (0.1 × 100)

M2 = 51.2 g

Hence, molar mass of substance is 51.2 g.

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