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For a gas phase cracking reaction $A{\rightarrow}B+C$ at $300^{\circ}$, the Gibbs free energy of the reaction at this temperature is $\Delta G^{\circ}=-2750$ $J$/mol. The pressure is $1$ bar and the gas phase cae be assumed to be ideal. The universal gas constant $R=8.314$ $J$/mol.$K$. The fractional molar conversion of $A$ at equilibrium is :

- $0.44$
- $0.50$
- $0.64$
- $0.80$