If benzoic acid ($\text{M} = 122 \text{ g mol}^{-1}$) is associated into a dimer when dissolved in benzene and the osmotic pressure of a solution of $6\cdot1 \text{ g}$ of benzoic acid in $100 \text{ mL}$ benzene is $6\cdot5 \text{ atm}$ at $27^{\circ}\text{C}$, then what is the percentage association of benzoic acid ? (Given : $\text{R} = 0\cdot0821 \text{ L atm K}^{-1} \text{ mol}^{-1}$)

Year	Paper Code	Set	Position
CBSE 2023	Series Other	Set 1	Question 29
CBSE 2023	Series Other	Set 1	Question 27
CBSE 2023	Series Other	Set 1	Question 28

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)