8. Thermochemistry

Given the thermochemical equation: H2(g) + Cl2(g) → 2 HCl(g); ΔH = -184 kJ, what is the value of the enthalpy change per mole of HCl(g) produced?

Which of the following reactions is best represented by a diagram showing a decrease in enthalpy (exothermic process)?

Which of the following statements regarding enthalpy is false?

Given the thermochemical equation: CH4(g) + 2 H2(g) → C2H6(g), calculate ΔH° for the reaction if the standard enthalpies of formation are: ΔH°f(CH4(g)) = -74.8 kJ/mol, ΔH°f(H2(g)) = 0 kJ/mol, and ΔH°f(C2H6(g)) = -84.7 kJ/mol.

Calculate ΔG°rxn at 25°C for the reaction: 2CH4(g) → C2H6(g) + H2(g). Given the following standard Gibbs free energies of formation: ΔG°f(CH4) = -50.8 kJ/mol, ΔG°f(C2H6) = -32.8 kJ/mol, ΔG°f(H2) = 0 kJ/mol.

Which of the following represents the standard heat of formation reaction for sodium chloride (NaCl) in its solid form?

Given the thermochemical equation: 2 O_3(g) → 3 O_2(g)ΔH = -284 kJ, what is the enthalpy change for this reaction per mole of O_3(g)?

Using the appropriate bond energies, calculate the enthalpy change (ΔH) for the reaction: H_2(g) + Cl_2(g) → 2HCl(g). Given the following average bond energies: H–H = 436 kJ/mol, Cl–Cl = 242 kJ/mol, H–Cl = 431 kJ/mol.

When 3.50 g of Ba(s) is added to 100.00 g of water in a container open to the atmosphere, the reaction shown below occurs and the temperature of the resulting solution rises from 22.00°C to 47.40°C. If the specific heat of the solution is 4.18 J/(g °C), calculate the heat absorbed by the solution.

For which one of the following reactions is the value of ΔH°_rxn equal to ΔH°_f for the product?

Given the reaction: CH_4(g) + 4 Cl_2(g) → CCl_4(l) + 4 HCl(g), what is the standard enthalpy change (ΔH°) for this reaction? Use the following standard enthalpies of formation: ΔH_f°(CH_4(g)) = -74.8 kJ/mol, ΔH_f°(Cl_2(g)) = 0 kJ/mol, ΔH_f°(CCl_4(l)) = -139.3 kJ/mol, ΔH_f°(HCl(g)) = -92.3 kJ/mol.

Which of the following is a feature of a thermochemical equation?

Which of the following best describes what thermochemistry involves?

Which of the following correctly describes how to calculate the enthalpy change (ΔH) of a reaction using bond energies?

Which of the following is the thermodynamic product formed during the reaction of 1,3-butadiene with HBr under conditions of high temperature and long reaction time?