Consider the reaction of a to form b: 2a< —> b. kc=1.8x10^-5(at 298k). a reaction mixture at 298k initially contains [a]=0.50m. what is the concentration of b when the reaction reaches equilibrium? the answer is 4.5x10^-6m but how do i get that answer?

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Solid tin exists in two forms: white and gray. for the transformation sn(s, white) → sn(s, gray) the enthalpy change is -2.1 kj/mol and the entropy change is -7.4 j/(mol*k). a. calculate the gibbs free energy change for the conversion of 1.00 mol white tin to gray tin at -30℃. b. will white tin convert spontaneously to gray tin at -30℃? c. at what temperature are white and gray tin thermodynamically equivalent at a pressure of 1 atm?