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Two solid compounds X and Y dissociates ...

Two solid compounds X and Y dissociates at a certain temperature as follows
`X(s) iff A(g) + 2B(g): K_(P1)= 9 xx 10^-3 atm^3`
`Y(s) iff 2B(g) + C(g), K_(P2) = 4.5 xx 10^-3 atm^3`
The total pressure of gases over a mixture of X and Y is:

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B
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