when 2g of a gas A is introduced into an evacuated flask kept at

Question

25 centigrade, the pressure is found to be 1 atmosphere.if 3g of another gas is then added to the same flask, the total pressure becomes 1.5atm. assuming ideal behaviour, the ratio of their molecular weights is

Answer 1

call the 2nd gas B

3 g of B is half as many moles as 2 g of A

B / A = 3 / 1