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Speak With a Friendly Mentor. ###### Aparna posted an Question
January 26, 2021 • 23:05 pm 30 points
• IIT JAM
• Biotechnology (BT)

## In the question like qs no 14,the r value for calculation will be given or not? there are multiple r value for different qu...(plz read description

in the question like qs no 14,the R value for calculation will be given in the exam or not? like there are multiple R value for different type of questions and I'm always in confusion...which value we should put where.. can anyone help me with this...

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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

• ##### Priyanshu kumar Best Answer

Gas constant R value depends on different pressure unit...check the pressure unit then accordingly use R value...check the below attached image for better understanding

In ques 14 pressure unit atm is given ...so corresponding R value should be 0.0821 Latm K^-1 mol^-1

now confusion clear na?

yes, sir.... thanks

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