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Membrane osmometry is a technique used to find the molecular weight of polymers by determining the osmotic pressure of a solvent across a semipermeable membrane. What is the molecular weight of the water soluble polymer, polyacrylamide, with a concentration of 100 g/L that produces an osmotic pressure of 8 × 10−3 atm at 25◦C?
1. 30,900 g/mol
2. 305,000 g/mol
3. 2,600,000 g/mol
4. 25,600 g/mol
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