Initially, we have $P_{A}=P_{B}=P_{C}=0.100 \mathrm{atm}$. At equilibrium, the pressure of C is $P_{C}=0.040 \mathrm{atm}$. This means the change in pressure for A, B, and C are $-0.060$, $+0.120$, and $-0.060$ respectively. Therefore, the equilibrium pressures
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