0.4 mol of a gas in a 2.0 L vessel exerts a pressure of 1.15 atm at a certain temperature. Under the same conditions 0.4 mol of an ideal gas would exert 1.20 atm. If the volume of the molecules is neg

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0.4 mol of a gas in a 2.0 L vessel exerts a pressure of 1.15 atm at a certain temperature. Under the same conditions 0.4 mol of an ideal gas would exert 1.20 atm. If the volume of the molecules is negligible, the van der Waals constant 'a' (in atm L 2 / mol 2 ) is

TestHub · Accepted Answer

With b neglected, P i d e a l ​ − P = a n 2 / V 2 . 1.20 − 1.15 = 0.05 = a × ( 0.4 ) 2 / ( 2.0 ) 2 = 0.04 a . a = 1.25 atm L 2 / mol 2 . Answer: (B).

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