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A 6.00L reaction vessel at 491°C contained 0.488 mol H2, 0.206 mol I2 and 2.250 mol HI. Assuming the substances are at equilibrium, find the value of Kc at 491°C for the reaction of hydrogen and iodine to give hydrogen iodide. The equation is H2(g) + I2(g) -> HI(g) If the above reaction was...