Answer:
19kPa
Explanation:
the total pressure is given by [tex]p_A+p_B[/tex]
The pressure [tex]p_A=X_A\times P^0_A[/tex]
similarly [tex]p_B=X_B\times P^0_B[/tex]
for equilibrium process let us consider both have one mole
so [tex]x_A=\frac{1}{1+1}=0.5[/tex]
similarly [tex]x_B=\frac{1}{1+1}=0.5[/tex]
so [tex]P_A=0.5\times 20=10kPa[/tex]
[tex]P_B=0.5\times 18=9kPa[/tex]
so total pressure=10+9=19 kPa
