At the transition temperature T, A B and G^0 = 105 - 35 T where A and B are two states of substance X. The transition temperature in °C when pressure is 1 atm is _______. (Nearest integer)

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Correct answer: A. A

At the transition temperature and 1 atm pressure, the two states A and B are in equilibrium. For a phase transition of a pure substance at 1 atm, both states are in their standard states, so the reaction quotient Q = 1. Using the relation G = G^0 + RT Q, we get G = G^0. At equilibrium, G = 0, which implies G^0 = 0. Given G^0 = 105 - 35 T, we can equate it to zero: 105 - 35 T = 0 35 T = 105 T = 3 T = 10^3 = 1000 K Converting the temperature to Celsius: T(^ C ) = 1000 - 273 = 727^ C Answer: 727

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