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Problem Set 12 Solutions 1. What is the increase in entropy of one gram of ice at OoC is melted and heated to 500C? The change in entropy is given by dS = dQ T. In this case, the dQ must be calculated in two pieces. First there is the heat needed to melt the ice, and then there is the heat needed to raise the temperature of the system ...
Calculate the change in entropy of the surroundings when water freezes at −10.°C; use ΔHfus(H2O) = 6.0 kJ·mol−1 at −10.°C. Answer: We can expect the entropy of the surroundings to increase when water freezes because the heat released stirs up the thermal motion of the atoms in the surroundings.
ΔSsys is the entropy change of the system. ΔSsurr is the entropy change of the surroundings. I.) ΔStotal = ΔS sys + ΔSsurr. ΔStotal = 30 J/K + 50 J/K. ΔStotal = 80 J/K. The total entropy change is positive, therefore the reaction will be spontaneous. II.) ΔStotal = ΔS sys + ΔSsurr. ΔStotal = 60 J/K + -85 J/K. ΔStotal = -25 J/K. The ...
Worksheet on Entropy and Free Energy. Define entropy in your own words, and list the variables or conditions that you must consider when comparing the entropy of two substances, or when trying to determine the relative change in entropy.
1. Calculate the change in entropy of a large vat of molten copper when 50 J of energy is removed reversible from it as heat at 1100 °C. 2. Calculate the change in entropy of 1.0 L of water at 0 °C when it absorbs 235 J of energy from a heater.
The full unit for entropy is J K-1 mol-1; The standard entropy change (ΔS system ꝋ ) for a given reaction can be calculated using the standard entropies (S ꝋ ) of the reactants and products; The equation to calculate the standard entropy change of a system is: ΔS system ꝋ = ΣΔS products ꝋ - ΣΔS reactants ꝋ (where Σ = sum of)
The standard entropy change (Δ Ssystemꝋ ) for a given reaction can be calculated using the standard entropies (Sꝋ ) of the reactants and products. The equation to calculate the standard entropy change of a system is: ΔSsystemꝋ = ΣSproductsꝋ - ΣSreactantsꝋ. (where Σ = sum of)
