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Two thermally insulated vessels are connected by a tube fitted with a valve that is initially closed as shown in the figure below. One vessel of volume V1 = 15.0 L, contains oxygen at a temperature of T1 = 275 K and a pressure of P1 = 1.79 atm. The other vessel of volume V2 = 21.0 L contains oxygen at a temperature of T2 = 445 K and a pressure of P2 = 2.30 atm. When the valve is opened, the gases in the two vessels mix and the temperature and pressure become uniform throughout.a) What is the final temperature (in K)?
ans:364
b) What is the final pressure (in atm)?
ans:2.09

madmax2015

(a) first, u should calculate out the number of mole of both vessels.
As mass of gas is directly proportional to mole
So u can use the equation of heat mixture:
n1V1(T-275)=n2V2(445-T)
(b) use the conservation of no. of mole as AL pastpaper as usually practice