1) Describe in detail the difference in absolute entropy values for the following pairs:
a) C(s, graphite) and C(s, diamond)
b) HCl(g) and HCl(aq)
c) CH4(g) and CH3CH2CH2CH3(g)
a) Calculate the values of DeltaH° and DeltaS° for the following reaction at 25°C.
b) Use the values from a to calculate DeltaG° for the following reaction at 25°C.
c) Explain fully whether this reaction spontaneous or non-spontaneous at 25°C?
2 CH3OH(g) + H2(g) -> C2H6(g) + 2 H2O(g) @ 25.0°C
a) Use thermodynamics to prove that the reaction shown below is non-spontaneous at room temperature (25 °C).
b) Calculate the temperature at which the reaction would just begin to become spontaneous.
MgCl2(s) + H2O(l) -> MgO(s) + 2 HCl(g)
5) Commercials make the claim that "a diamond is forever." Use thermodynamics to either prove or disprove this claim by calculating:
a) the entropy change.
b) the free energy change for the reaction below, and
c) by comparing DeltaGf° for graphite and diamond.
C(diamond) -> C(graphite)© BrainMass Inc. brainmass.com October 16, 2018, 6:09 pm ad1c9bdddf
This solution describes the difference in absolute entropy values for 3 different
Entropy, Free Energy, Equilibrium
1. Define entropy and relate to probability of microstate formation.
2. Relate entropy and reaction spontaneity, Gibbs free energy and reaction spontaneity, and Gibbs free energy and the equilibrium constant of a reaction.
3. Calculate the entropy change within a system and determine absolute entropies.
4. In your own words, define entropy. Provide one everday example resulting in an increase in entropy, and another resulting in a decrease.View Full Posting Details