1000 ml of a gas A at 600 torr and 500 ml of gas B at 800 torr are placed in a 2 L flask. The final pressure will be

From Dalton's partial pressure lawP1=10001500×600+5001500×800     =400 + 8003=20003torr. V1=1500 mL P2 = ? V2 = 2L = 2000 mL From P ∝1V P1P2=V2V1⇒2000/3P2=20001500 ⇒P2=15003=500  torr