The final pressure inside inside the system is 1.61 atm.
What is ideal gas equation?
The ideal gas law, also called the general gas equation, is the equation of state of a hypothetical ideal gas. It is a good approximation of the behavior of many gases under many conditions, although it has several limitations.
Pressure on mixing
The sum of pressure exerted by individual gases is equal to net pressure on mixing.
At constant pressure
PV=nRT
nRT = constant
For mixture of 3 gases
P1V1+P2V2+P3V3=Pnet[total pressure on mixing]
0.792 atm×4.0L+1.23 atm×3.0+2.5 atm×5.0L =Pnet×12L
19.08=Pnet×12L
Pnet=1.61 atm
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