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57 solutions

Hess's Law

Q. Use molar enthalpies for reactions 1, 2 and 4-8 (repeated below) CH4 (g) + H2O (g) → 3H2 (g) + CO (g) (rxn 1) CO (g) + H2O (g) → H2 (g) + CO2 (g) (rxn 2) C5H12 (l) + 8O2 (g) → 5CO2 (g) + 6H2O (l) (rxn 4) CH4 (g) + 2O2 → CO2 (g) + 2H2O (l) (rxn 5) CH4 (g) + 3/2O2 → CO (g) + 2H2O (l) (rxn 6) CO (g) + 1/2 O2 (g) → CO2 (g) (rxn 7) H2O (l) → H2O (g) (rxn 8) To determine ΔH° for reaction 3: 11H2 (g) + 5CO → C5H12 (l) + 5H2O (l) (rxn 3) There are several ways to do this with the reactions provided here, you will not need to use all of the chemical equations. Solve algebraically for now; you will be given the H values in recitation.

Solved • Dec 4, 2019

Hess's Law

Q. Use Hess's law to calculate ΔG°rxn using the following information. ClO(g) + O3(g) → Cl(g) + 2O2(g) ΔG°rxn = ? 2O3(g) → 3O2(g) ΔG°rxn = +489.6 kJ Cl(g) + O3(g) → ClO(g) + O2(g) ΔG°rxn = -34.5 kJ a) +524.1 kJ b) -472.4 kJ c) -262.1 kJ d) -524.1 kJ e) +210.3 kJ

Solved • Dec 2, 2019

Hess's Law

Q. Given the following information, determine ΔH for 3H2(g) + O3(g) 3H2O(g). 2H2(g) + O2(g) -----> 2H2O(g) ΔH= -483.6 kj/mol 3O2(g) -----> 2O3(g) ΔH= 284.6 kj/mol (a)−199 kJ/mol (b)−1010 kJ/mol (c)−867.7 kJ/mol (d)+768.2 kJ/mol (e)−440.8 kJ/mol

Solved • Dec 1, 2019

Hess's Law

Q. Calculate ΔH for the reaction: CO(g) + NO(g) → CO2(g) + ½ N2(g) Given: CO(g) + ½ O2(g) → CO2(g) ΔH = -283.0 kJ N2(g) + O2(g) → 2NO(g) ΔH = 180.6 kJ

Solved • Dec 1, 2019

Hess's Law

Q. Using the thermochemical data attached, calculate the delta H for the reaction

Solved • Nov 25, 2019

Hess's Law

Q. Consider these reactions where M represents a generic metal. Use the given information to determine the enthalpy of the reaction

Solved • Nov 21, 2019

Hess's Law

Q. Calculate the standard reaction enthalpy for the following chemical equation. CH4(g) + H2O(g) → CO(g) + 3H2(g) Use the following thermochemical equations to solve for the change in enthalpy. 2H2(g) + CO(g) → CH3OH(l) ΔH° = -128.3 kJ 2CH4(g) + O2(g) → 2CH3OH(l) ΔH° = -328.1 kJ 2H2(g) + O2(g) →2H2O(g) ΔH° = -483.6 kJ a) +206.1 kJ b) +216 kJ/mol c) +42.0 kJ d) +155.5 kJ

Solved • Nov 19, 2019