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97 solutions

Enthalpy of Formation

Q. Consider the following reaction: 2NO2(g) ⇌ 2NO(g) + O2(g) The data in the table show the equilibrium constant for this reaction measured at several different temperatures. Use the data to find ΔH°rxn for the reaction. Express your answer in kilojoules per mole.

Solved • Oct 11, 2019

Enthalpy of Formation

Q. The standard enthalpy change for the reaction of SO3(g) with H2O(l) to yield H2SO4(aq) is ΔH° = -227.8 kJ. Use the following information S(s) + O2(g) → SO2(g) ΔH° = -296.8 kJ SO2(g) + 1/2 O2(g) → SO3(g) ΔH° = -98.9 kJ to calculate ΔH°f for H2SO4(aq) (in kilojoules per mole). [For H2O(l). ΔH°f = -285.8 kJ/mol]. Express your answer using four significant figures.

Solved • Nov 10, 2019

Enthalpy of Formation

Q. How much energy is released when 8.5 moles of O2 reacts with excess CH4(g)?

Solved • Nov 10, 2019

Enthalpy of Formation

Q. Methanol burns in oxygen to form carbon dioxide and water. Calculate ΔH°rxn at 25 degrees C.

Solved • Oct 11, 2019

Enthalpy of Formation

Q. Calculate the enthalpy change using the net ionic equation for the given neutralization reaction at 25 ∘C. The values of Δ𝐻∘f can be found in the Thermodynamic Properties at 298 K table. Ba(OH)2(aq)+2HBr(aq)⟶BaBr2(aq)+2H2O(l) Δ𝐻∘neutralization= kJ

Solved • Nov 6, 2019

Enthalpy of Formation

Q. What is the enthalpy change when 38.7 mL of 0.520 M sulfuric acid reacts with 15.1 mL of 0.286 M potassium hydroxide? H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l) ΔH° = –111.6 kJ/mol

Solved • Nov 25, 2017

Enthalpy of Formation

Q. Bond energy: Hydrogen, a potential future fuel, can be produced from carbon and stem by this reaction: C + 2H20 ------> H2 + CO2 use the average bond energies to calculate delta Hrxn for the reaction.

Solved • Nov 4, 2019