In plotting ln(Ksp) vs. 1/T, the slope and y-intercept are both found to be negative. Determine the sign of ΔH and ΔS, and determine under which temperatures this reaction would be spontaneous.

A 1 mole sample of ideal gas expands isothermally at 300 K from a volume of 20.00 L to a volume of 30.00 L. Calculate the ΔG and the ΔS for this process.

Which statement is INCORRECT with respect to thermodynamics? A) The sign of ΔG for a reaction is primarily determined by the sign of ΔH of the reaction.  B) The entropy of a perfect crystal at absolute zero is zero. C) Enthalpy can be thought of as the "heat content" of a system. D) For a reaction to be spontaneous, there must be an increase in the entropy of the universe. E) For a spontaneous reaction, the entropy of the reaction always increases.

A helium-filled balloon at 1.00 atm pressure has a volume of 1.200 L. It is placed in a freezer and its volume decreases, stopping at 1.010 L.  (Assume that the static internal and external pressures are equal, that the balloon contains only helium, and helium behaves as an ideal gas.)  Calculate ΔE for the gas in the balloon.