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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

Hess's Law

Q. Calculate the standard enthalpy change for the following chemical equation. 4FeO(s) + O2(g) → 2Fe2O2(s) Use the following thermochemical equations to solve for the change in enthalpy. Fe(s) + 1/2O2(g) → FeO(s) ΔH= -269 kJ 2Fe(s) + 3/2O2(g) → Fe2O2(s) ΔH= -825 kJ a) -2726 kJ b) -556 kJ c) -574 kJ/mol d) 556 kJ e) 574 kJ/mol

Solved • Nov 19, 2019