Tell whether reactions with the following values of Δ H and Δ S are spontaneous or non spontaneous and whether they are exothermic or endothermic. (a) Δ H = − 128 kJ; Δ S = 35 J/K at 500 K (b) Δ H = + 67 kJ; Δ S = − 140 J/K at 250 K (c) Δ H = + 75 kJ; Δ S = 95 J/K at 800 K
Tell whether reactions with the following values of Δ H and Δ S are spontaneous or non spontaneous and whether they are exothermic or endothermic. (a) Δ H = − 128 kJ; Δ S = 35 J/K at 500 K (b) Δ H = + 67 kJ; Δ S = − 140 J/K at 250 K (c) Δ H = + 75 kJ; Δ S = 95 J/K at 800 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 non spontaneous and whether they are exothermic or endothermic. (a)
Δ
H
=
−
128 kJ;
Δ
S
=
35 J/K at 500 K
(b)
Δ
H
=
+
67 kJ;
Δ
S
=
−
140 J/K at 250 K
(c)
Δ
H
=
+
75 kJ;
Δ
S
=
95
J/K at 800 K
What is the ΔE for a system which has the following two steps:Step 1: The system absorbs 60 J of heat while 40 J of work are performed on it.Step 2: The system releases 30 J of heat while doing 70 J of work.(a) 0 J(b) 100 J(c) 30 J(d) 90 J
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
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.
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The Laws of Thermodynamics, Entropy, and Gibbs Free Energy; Author: Professor Dave Explains;https://www.youtube.com/watch?v=8N1BxHgsoOw;License: Standard YouTube License, CC-BY