Gaseous StateMedium
Question
When 2 g of gas A is introduced into an evacuated flask kept at 25oC, the pressure was found to be 1 atomsphere. If 3 g of another gas B is then added to the same flask, the pressure becomes 1.5 atm. Assuming ideal behaviour, the ratio of molecules weights (MA : MB) is
Options
A.1 : 3
B.3 : 1
C.2 : 3
D.3 : 2
Solution
Moles ∝ Pressure
i.
∝ 1 atm
Pressure of B = 1.5 - 1 = 0.5 atm
ii.
∝ 0.5 atm
= 0.5 × 
∴ MwA : MwB = 1 : 3
i.
∝ 1 atmPressure of B = 1.5 - 1 = 0.5 atm
ii.
∝ 0.5 atm = 0.5 × ∴ MwA : MwB = 1 : 3
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