Energetics

What is the unit of enthalpy change (ΔH) in the SI system?

Which of the following statements is true for an exothermic reaction?

Calculate the amount of heat released when 2 moles of methane (CH₄) combust completely if the enthalpy change of combustion is -890 kJ/mol.

Which law states that enthalpy change for a reaction is the same whether it occurs in one step or multiple steps?

Given the bond enthalpies: C–H = 412 kJ/mol, O=O = 498 kJ/mol, C=O (in CO₂) = 799 kJ/mol, calculate the approximate enthalpy change for the combustion of methane: CH₄ + 2O₂ → CO₂ + 2H₂O (O–H bond enthalpy = 463 kJ/mol).

Which of the following is NOT a state function?

In an endothermic reaction carried out at constant pressure, what happens to the enthalpy (H) of the system?

Which of the following represents the correct mathematical expression for the first law of thermodynamics?

At constant volume, the heat exchanged (qᵥ) is equal to:

Which of the following is the correct expression for calculating standard enthalpy change of reaction using bond enthalpies?