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0·70g of an Organic Compound, When Dissolved in 32g of Acetone, Produces An Elevation of 0·25°C in the Boiling Point. Calculate the Molecular Mass of the Organic Compound (Kb for Acetone = 1·72 K Kg `Mol^(-1)`). - Chemistry (Theory)

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ConceptRelative Molecular Mass of Non-volatile Substances Boiling Point Elevation

Question

0·70g of an organic compound, when dissolved in 32g of acetone, produces an elevation of 0·25°C in the boiling point. Calculate the molecular mass of the organic compound (Kb for acetone = 1·72 K kg `mol^(-1)`).

Solution

Given

Mass of solute = 0.70 g (`w_2`)

Mass of solvent = 32 g (`w_1`)

`DeltaT_b = 0.25 °C`

`K_b = 1.72 K.Kg mol^(-1)`

To find = `M_2`(molecular mass of organic compound)

Formula => `M_2 = (1000 K_bw_2)/(w_1 Delta T_b)`

`M_2 = (1000 xx 1.72 xx 0.70)/(32xx 0.25)`

`M_2 = 150.5 g`

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APPEARS IN

 2014-2015 (March) (with solutions)
Question 2.1.3 | 1.00 mark
Solution 0·70g of an Organic Compound, When Dissolved in 32g of Acetone, Produces An Elevation of 0·25°C in the Boiling Point. Calculate the Molecular Mass of the Organic Compound (Kb for Acetone = 1·72 K Kg `Mol^(-1)`). Concept: Relative Molecular Mass of Non-volatile Substances - Boiling Point Elevation.
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