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Yogita Basnal
Here, R = 0.08206 L atm K^-1 mol^-1. We use this value of R while solving numericals related to osmotic pressure in liquids. There is an another value of gas constant R = 8.31 JK^-1mol^-1 but value is used when we calculate Gibb's free energy. For osmotic pressure we use R = 0.08206 L atm K^-1 mol^-1 because the unit is in terms of pressure. They might give the value , they may not. Here, osmotic pressure = 0.20 x 0.082 x 293 = 4.80 atm