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  1. Problems
  2. /Chemical Thermodynamics
  3. /Enthalpy and Hess's Law

Enthalpy and Hess's Law

Chemistry
+ Upload a Problem
More in Chemical ThermodynamicsSystems, Work, Heat and the First LawEnthalpy and Hess's LawEntropy, Gibbs Energy and Spontaneity
11 problems
Type:
1.
Breaking one mole of CH₄(g) into atoms takes 1665 kJ. New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Hard
2.
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
3.
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
4.
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
5.
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
6.
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
7.
Ethanol burns as C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l). New
High School (11–12) · Enthalpy and Hess's LawStemPy LabStemPy Lab
Medium
8.
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
9.
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
10.
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
11.
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