Use standard enthalpies of formation to calculate ΔHᵣₓₙ for the following reaction: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g). Given the standard enthalpies of formation: CH₄(g) = -74.8 kJ/mol, O₂(g) = 0 kJ/mol, CO₂(g) = -393.5 kJ/mol, H₂O(g) = -241.8 kJ/mol.

Using the standard enthalpies of formation, calculate ΔH°rxn for the reaction: CaO(s) + CO2(g) → CaCO3(s). Given: ΔH°f [CaO(s)] = -635.1 kJ/mol, ΔH°f [CO2(g)] = -393.5 kJ/mol, ΔH°f [CaCO3(s)] = -1206.9 kJ/mol.

Use standard enthalpies of formation to calculate ΔH°rxn for the following reaction: N2O4(g) + 4H2(g) → N2(g) + 4H2O(g). Which of the following is the correct ΔH°rxn value?

Use standard enthalpies of formation to calculate ΔH°_rxn for the following reaction: CaO(s) + CO2(g) → CaCO3(s). Which of the following is the correct ΔH°_rxn value?

Use standard enthalpies of formation to calculate ΔH⁰_rxn for the following reaction: C(s) + H₂O(g) → CO(g) + H₂(g). Which of the following is the correct value for ΔH⁰_rxn?

Use standard enthalpies of formation to calculate ΔH⁰_rxn for the following reaction: N2O4(g) + 4H2(g) → N2(g) + 4H2O(g). Given the standard enthalpies of formation: ΔH⁰_f [N2O4(g)] = 9.16 kJ/mol, ΔH⁰_f [H2(g)] = 0 kJ/mol, ΔH⁰_f [N2(g)] = 0 kJ/mol, ΔH⁰_f [H2O(g)] = -241.8 kJ/mol.

Using the information below, calculate the enthalpy change (ΔH°rxn) for the following reaction: CH4 (g) + 4 Cl2 (g) → CCl4 (g) + 4 HCl (g). Given the standard enthalpy of formation (ΔHf°) values: CH4 (g) = -75 kJ/mol, CCl4 (g) = -96 kJ/mol, and HCl (g) = -92 kJ/mol.

What is the total change in enthalpy when 25.0 g of solid ethanol (C2H5OH) at -125 °C is converted to liquid ethanol at -80 °C? The table below provides physical and thermochemical data for ethanol. Normal melting point: -114 °C. Assume the specific heat capacities and enthalpy of fusion are known.

What is the standard enthalpy change (∆Hrxn) for the reaction 2 CHCl3(l) → 2 C(s) + H2(g) + 3 Cl2(g) given the standard enthalpy of formation of CHCl3(l) is -134.1 kJ/mol?