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  1. Problems
  2. /Chemical Thermodynamics
  3. /Entropy, Gibbs Energy and Spontaneity

Entropy, Gibbs Energy and Spontaneity

Chemistry
+ Upload a Problem
More in Chemical ThermodynamicsSystems, Work, Heat and the First LawEnthalpy and Hess's LawEntropy, Gibbs Energy and Spontaneity
10 problems
Type:
1.
For N₂O₄(g) ⇌ 2NO₂(g), Δ H° = +57.2 kJ/mol and Δ S° = +175.8 J/(K mol). New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Hard
2.
A reaction has K = 2.5 × 10⁻³ at 500 K. Find Δ G° at this temperature. New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Medium
3.
At 298 K a reaction has Δ G° = -17.1 kJ/mol. New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Medium
4.
Four reactions have these signs. (a) Δ H < 0, Δ S > 0. New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Easy
5.
Magnesium carbonate decomposes: MgCO₃(s) → MgO(s) + CO₂(g), with Δ H° = +117.6 kJ/mol and Δ S° =… New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Medium
6.
For N₂(g) + 3H₂(g) → 2NH₃(g), Δ H° = -92.4 kJ/mol and Δ S° = -198.7 J/(K mol). New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Medium
7.
Supercooled water freezes at 263 K. Take Δ H = -6.01 kJ/mol and Δ Ssystem = -22.0 J/(K mol). New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Hard
8.
Sulphur trioxide is made by 2SO₂(g) + O₂(g) → 2SO₃(g). New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Medium
9.
Predict the sign of Δ S for each change, and give the reason. New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Easy
10.
Benzene melts at 278.7 K, and its enthalpy of fusion is 9.87 kJ/mol. New
High School (11–12) · Entropy, Gibbs Energy and SpontaneityStemPy LabStemPy Lab
Easy