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  1. Problems
  2. /Chemical Thermodynamics

Chemical Thermodynamics

Chemistry
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31 problems
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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
11.
Breaking one mole of CH₄(g) into atoms takes 1665 kJ. New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Hard
12.
Estimate Δr H for C₂H₄(g) + H₂(g) → C₂H₆(g) from the mean bond enthalpies: C=C 611, H-H 435, C-C… New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
13.
Methane cannot be made cleanly from carbon and hydrogen, so its Δf Hᵒᵐⁱⁿᵘˢ is found with Hess's law. New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
14.
How much heat turns 36.0 g of ice at 273 K into steam at 373 K? New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
15.
On a cold dry morning, frost on a car turns straight to water vapour. New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Easy
16.
Quicklime is made by heating limestone: CaCO₃(s) → CaO(s) + CO₂(g). New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
17.
Ethanol burns as C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l). New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
18.
Argon is close to an ideal gas, with Cv = 12.47 J K⁻¹mol⁻¹. New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
19.
0.600 g of graphite burns completely in a bomb calorimeter whose heat capacity is 12.5 kJ K⁻¹. New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
20.
For CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l), Δ H = -890.3 kJ mol⁻¹ at 298 K. New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
21.
50.0 mL of 1.00 M hydrochloric acid is mixed with 50.0 mL of 1.00 M sodium hydroxide in a… New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Easy
22.
1.00 mol of an ideal gas at 300 K expands at constant temperature from 10.0 bar to 2.00 bar. New
High School (11–12) · Systems, Work, Heat and the First LawStemPy LabStemPy Lab
Hard
23.
2.00 mol of an ideal gas at 310 K expands reversibly and at constant temperature from 5.00 L to… New
High School (11–12) · Systems, Work, Heat and the First LawStemPy LabStemPy Lab
Medium
24.
0.80 mol of an ideal gas expands at constant temperature from 4.0 L into an evacuated vessel, until… New
High School (11–12) · Systems, Work, Heat and the First LawStemPy LabStemPy Lab
Easy
25.
A gas in a cylinder expands from 3.0 L to 8.0 L against a constant atmospheric pressure of 1.0 atm. New
High School (11–12) · Systems, Work, Heat and the First LawStemPy LabStemPy Lab
Medium
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