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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)

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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