Chapter 19, Problem 6a
Isomers are molecules that have the same chemical formula but different arrangements of atoms, as shown here for two isomers of pentane, C5H12.
(a) Do you expect a significant difference in the enthalpy of combustion of the two isomers? Explain.
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b. If energy can flow in and out of the system to maintain a constant temperature during the process, what can you say about the entropy change of the surroundings as a result of this process?
Predict the signs of ΞH and ΞS for this reaction. Explain your choice.
The accompanying diagram shows how entropy varies with temperature for a substance that is a gas at the highest temperature shown. (c) If this substance is a perfect crystal at T = 0 K, what is the value of S at this temperature?
Isomers are molecules that have the same chemical formula but different arrangements of atoms, as shown here for two isomers of pentane, C5H12.
(b) Which isomer do you expect to have the higher standard molar entropy? Explain.
The accompanying diagram shows how ΞH (red line) and TΞS (blue line) change with temperature for a hypothetical reaction.
(b) In what temperature range is this reaction spontaneous?
Consider a reaction A2(π) + B2(π) β 2 AB(π), atoms of A shown in red in the diagram and atoms of B shown in blue. (a) If πΎπ = 1, which box represents the system at equilibrium?