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For the reaction $N_2O_4(g) ⇄ 2 NO_2(g)$, a reaction mixture initially contains both substances at STP.
If $K_p$ = 1.5 at this temperature, which of the following statements is TRUE before any reaction occurs?
The reaction is at equilibrium.
The reaction will proceed to the right.
The reaction will proceed to the left.
The initial reaction mixture will remain unchanged when the reaction occurs.