One mole of each gases A, B, C and D with van der Waal's constant a (atm L^2 mol^-2) 1.348, 6.823, 4.390 and 2.438, respectively, are kept separately in four different vessels of equal volumes at iden

Question

One mole of each gases A, B, C and D with van der Waal's constant a (atm L^2 mol^-2) 1.348, 6.823, 4.390 and 2.438, respectively, are kept separately in four different vessels of equal volumes at identical temperature. Their pressures are observed to be PA, PB, PC and PD, respectively. On the basis of this data alone, the order of pressure of gases is (assume other van der Waal's constant to be nearly same for all gases)

Prashant Kotian · Accepted Answer

Correct answer: B. the van der waals constant 'a' measures intermolecular attraction forces. higher 'a' values mean stronger molecular attraction, which reduces the force of impact on the container walls and thus lowers the pressure. since a_b > a_c > a_d > a_a, the observed pressures follow the order pb < pc < pd < pa.

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