Can someone please help if you can’t do A B and C just do A and also for A and it’s not asking for the definition it’s asking for the air temperature will give Brain thanks

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For the reaction i2(g)+br2(g)←−→2ibr(g), kc=280 at 150 ∘c. suppose that 0.450 mol ibr in a 2.00-l flask is allowed to reach equilibrium at 150 ∘c. what is the equilibrium concentration of 2ibr, i2, br2