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# The solution containing 4.0g of a polyvinyl chloride polymer in 1 litre of dioxane was found to have an osmotic pressure $6.0 \times 10^{−4}$ atmosphere at 300K , the value of R used is 0.082 litre atmosphere mole$^{−1} K^{−1}$ . The molecular mass of the polymer was found to be

$1.6 \times 10^5$