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Unformatted text preview: hange, ΔS°, for the reaction at 862°C is positive, negative, or zero. Justify your
ΔS° is positive because four moles of gaseous products are produced from
three moles of gaseous reactants. One point is earned for
the correct explanation. (e) State whether the enthalpy change, ΔH°, for the reaction at 862°C is positive, negative, or zero. Justify your
Both ΔG° and ΔS° are positive, as determined in parts (c) and (d).
Thus, ΔH° must be positive because ΔH° is the sum of two positive
terms in the equation ΔH° = ΔG° + TΔS°. One point is earned
for the correct sign.
One point is earned for a
correct explanation. (f) After a certain period of time, 1.000 mol of O2(g) is added to the mixture in the flask. Does the mass of
U3O8(s) in the flask increase, decrease, or remain the same? Justify your answer.
The mass of U3O8(s) will increase because the reaction is at equilibrium,
and the addition of a product creates a “stress” on the product (right) side of
the reaction. The reaction will then proceed from right to left to ree...
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This note was uploaded on 10/01/2009 for the course OC 9876 taught by Professor Dq during the Spring '09 term at UC Merced.
- Spring '09