The van der Waal's parameters for gases W, X, Y and Z are Gas a (atm l^2/mol^2) b (l/mol) W 4.0 0.027 X 8.0 0.030 Y 6.0 0.032 Z 12.0 0.027 Which one of these gases has the highest critical temperature

Question

The van der Waal's parameters for gases W, X, Y and Z are Gas a (atm l^2/mol^2) b (l/mol) W 4.0 0.027 X 8.0 0.030 Y 6.0 0.032 Z 12.0 0.027 Which one of these gases has the highest critical temperature?

Prashant Kotian · Accepted Answer

Correct answer: D. Critical temperature T_c = 8a / 27Rb, which is directly ∝ the ratio a/b. Ratios: W: 148, X: 267, Y: 187, Z: 444. Since Z has the highest a/b ratio, it has the highest critical temperature .

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