When a gas A is introduced into an evacuated flask kept at 25°C, the pressure is found to be one atmosphere. If an equal mass of another gas B is then added to the same flask, the total pressure becom

Question

When a gas A is introduced into an evacuated flask kept at 25°C, the pressure is found to be one atmosphere. If an equal mass of another gas B is then added to the same flask, the total pressure becomes 3 atm. Assuming ideal gas behaviour, the ratio of the molecular weights M A ​ : M B ​ is

TestHub · Accepted Answer

p B ​ = 3 − 1 = 2 atm ; equal masses, same V, T: n ∝ p so n B ​ n A ​ ​ = 2 1 ​ . Equal mass: M B ​ M A ​ ​ = n A ​ n B ​ ​ = 1 2 ​ .

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