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Enthalpy of Formation

Q. According to the equation below, what is the enthalpy change when 400.0 g of propane is burned in excess oxygen? C3H8 (g) + 5O2 (g) ) → 3CO2 (g) + 4H2O (l) ΔH = -2221kJ

Solved • Mar 19, 2019

Enthalpy of Formation

Q. Ammonia reacts with oxygen according to the equation: 4NH3(g)+5O2(g)→4NO(g)+6H2O(g)ΔHrxn=−906kJ Calculate the heat (in kJ) associated with the complete reaction of 295 g of NH3.

Solved • Mar 10, 2019

Enthalpy of Formation

Q. Use standard enthalpies of formation to determine ΔHorxn for the reaction: Al2O3(s)+3CO(g)→2Al(s)+3CO2(g)

Solved • Mar 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. Gasoline is composed primarily of hydrocarbons, including many with eight carbon atoms, called octanes. One of the cleanest-burning octanes is a compound called 2,3,4-trimethylpentane, which has the structural formula shown in the figure (Figure 1) . The complete combustion of one mole of this compound to CO2(g) and H2O(g) leads to ΔH∘ = -5064.9 kJ/mol.

Solved • Oct 7, 2017