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The equilibrium constant for the reactio...

The equilibrium constant for the reaction
`N_2(g) +O_2(g)iff2NO` is `K_1`
and the equilibrium constant for the reaction
2NO(g)+O_2(g)iff2NO_2(g)` is `K_2`
What will be the equilibrium constant for the reaction
`N_2(g)+2O_2(g)iff2NO_2(g)`

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