5 g of a non-volatile, water-soluble compound X is dissolved in 100 g of water ( K_b = 0.52 K kg mol ⁻¹ ). The elevation in boiling point is found to be 1.3 K . The molar mass of compound X is:

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Correct answer: A. 20 g

T_b = K_b m = K_b w₂ M₂ w₁ M₂ = K_b w₂ T_b w₁ = 0.52 5 1.3 0.1 = 2.6 0.13 = 20 g/mol

5 g of a non-volatile, water-soluble compound X is dissolved in 100 g of water ( K_b = 0.52 K kg mol ⁻¹ ). The elevation in boiling point is found to be 1.3 K . The molar mass of compound X is:

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