Tell whether reactions with the following values of Δ H and Δ S are spontaneous or nonspontaneous and whether they are exothermic or endothermic. (a) Δ H = − 4 8 kJ; Δ S = + 13 5 J/K at 400 K (b) Δ H = − 4 8 kJ; Δ S = − 13 5 J/K at 400 K (c) Δ H = + 4 8 kJ; Δ S = + 13 5 J/K at 400 K (d) Δ H = + 4 8 kJ; Δ S = − 13 5 J/K at 400 K
Tell whether reactions with the following values of Δ H and Δ S are spontaneous or nonspontaneous and whether they are exothermic or endothermic. (a) Δ H = − 4 8 kJ; Δ S = + 13 5 J/K at 400 K (b) Δ H = − 4 8 kJ; Δ S = − 13 5 J/K at 400 K (c) Δ H = + 4 8 kJ; Δ S = + 13 5 J/K at 400 K (d) Δ H = + 4 8 kJ; Δ S = − 13 5 J/K at 400 K
Solution Summary: The author explains the Gibb's free energy of a system, which indicates the energy that can be used to do work.
Tell whether reactions with the following values of
Δ
H
and
Δ
S
are spontaneous or nonspontaneous and whether they are exothermic or endothermic. (a)
Δ
H
=
−
4
8 kJ;
Δ
S
=
+
13
5 J/K at 400 K
(b)
Δ
H
=
−
4
8 kJ;
Δ
S
=
−
13
5 J/K at 400 K
(c)
Δ
H
=
+
4
8 kJ;
Δ
S
=
+
13
5 J/K at 400 K
(d)
Δ
H
=
+
4
8 kJ;
Δ
S
=
−
13
5 J/K at 400 K
The normal boiling point of Br2(l) is 58.8 °C, and itsmolar enthalpy of vaporization is ΔHvap = 29.6 kJ/mol.(a) When Br2(l) boils at its normal boiling point, does itsentropy increase or decrease? (b) Calculate the value of ΔSwhen 1.00 mol of Br2(l) is vaporized at 58.8 °C.
For the isothermal expansion of a gas into a vacuum,ΔE = 0, q = 0, and w = 0. (a) Is this a spontaneous process?(b) Explain why no work is done by the system duringthis process. (c) What is the “driving force” for the expansionof the gas: enthalpy or entropy?
5.) Indicate whether each statement is true of false?
(a) The second law of thermodynamics says that entropy is conserved.
(b) If the entropy of the system increases during a reversible process, the entropy change of the surroundings must decrease by the same amount.
(c) In a certain spontaneous process the system undergoes an entropy change of 4.2 J/ K; therefore, the entropy change of the surroundings must be -4.2 J/K.
Group of answer choices
A.) (a) false
(b) true
(c) false
B.) (a) false
(b) true
(c) true
C.) (a) false
(b) false
(c) false
D.) (a) true
(b) false
(c) true
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Calorimetry Concept, Examples and Thermochemistry | How to Pass Chemistry; Author: Melissa Maribel;https://www.youtube.com/watch?v=nSh29lUGj00;License: Standard YouTube License, CC-BY