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A solution contains a non-volatile solute of molecular mass M₂. Which expression can be used to determine the molecular mass of the solute using osmotic pressure?

1. M₂ = (m₂/m₁) VRT
2. M₂ = (m₂/V) RT / π
3. M₂ = (m₂/V) RT π
4. M₂ = (m₂/V) π / RT

Correct answer: M₂ = (m₂/V) RT / π

Solution

The correct expression relates the osmotic pressure (π) to the concentration of the solute (m₂/V) and the ideal gas constant (R) and temperature (T), allowing for the calculation of the molecular mass (M₂) by rearranging the formula to isolate M₂.

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