Calculate the mass of a non-volatile solute (molar mass 40 g mol⁻¹) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

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Solution

Let the vapour pressure of pure octane be

Then, the vapour pressure of the octane after dissolving the non-volatile solute is

Molar mass of solute, M₂ = 40 g mol⁻¹

Mass of octane, w₁ = 114 g

Molar mass of octane, (C₈H₁₈), M₁ = 8 × 12 + 18 × 1

= 114 g mol⁻¹

Applying the relation,

Hence, the required mass of the solute is 8 g.

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QUESTION 2.18

Calculate the mass of a non-volatile solute (molar mass $40 g m o l^{- 1}$ ) which should be dissolved in 114g octane to reduce its vapour pressure to $80 %$ .

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which should be dissolved in

114 g

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, is-

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Calculate the mass of a non-volatile solute (molar mass 40 g mol−1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

Calculate the mass of a non-volatile solute (molar mass 40 g mol⁻¹) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.