An experimenter placed 1.000 mol of H2 and 1.000 mol of I2 in a 1.000-L flask. The substances reacted to produce hydrogen iodide:

When the contents of the flask came to equilibrium at 458oC, the experimenter found that it contained 0.225 mol H2, 0.225 mol I2, and 1.550 mol HI.
a. Calculate the standard free-energy change for the reaction at 458oC.
b. Assume that the standard enthalpy change for the reaction at 458oC is the same as it is at 298oC. Calculate the standard entropy change for the reaction at 458oC.

Transcribed Image Text:

H2(g) + 2(g) = 2HI(g)