Question

When 2 gms of a gas are introduced into an evacuated flask kept at 25°C the pressure is found to be one atmosphere. If 3 gms of another gas added to the same flask the pressure becomes 1.5 atmosphere. The ratio of the molecular weights of these gases will be 

(A) 1: 3

 (B) 3: 1 

(C) 2: 3 

(D) 3: 2

Answer 1

Correct option (A) 1: 3

Explanation

 For P = 1 atm, m₁ = 2gms, T=298 K