Αποτελέσματα Αναζήτησης
Define Gibb’s free energy, enthalpy, and entropy, and the relationship between them. Predict the sign of ΔS in the following processes. Briefly explain your answer: Calculate ΔS°, ΔH°, and ΔG° for following reactions using standard values of formation.
Explain how you know if each of the following change in states result in an increase or decrease in entropy. solid to liquid; liquid to gas; gas to liquid
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.
Calculate the change in the entropies of the system and the surroundings, and the total entropy change when a sample of oxygen gas of mass 50 g at 300 K and 1 bar doubles its volume in:
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.
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 ...
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.
