8. Thermochemistry

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.

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.

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?

Which of the following is required for a correctly written thermochemical equation?

Is the dissolution reaction of urea in water enthalpically favored?

Which of the following is a correctly written thermochemical equation?

What is the change in enthalpy (ΔH) when 1 mol of H2(g) is completely reacted according to the following thermochemical equation? 2 H2(g) + O2(g) → 2 H2O(l)ΔH = -571.6 kJ

For the freezing of water, represented by the equation H2O(l) → H2O(s), what are the signs of ΔH (enthalpy change) and ΔS (entropy change)?