Thermochemical Equations Answers

Which of these statements are true? Select all that apply.The Hf for Br2(I) is 0 kJ/mol.The Hf for He(I) is 0 kJ/mol.The Hf for Hg(I) is 0 kJ/mol.The Hf for Cl2(g) is 0 kJ/mol.The Hf for N2(I) is 0 kJ/mol.

This reaction is .

What is the enthalpy of reaction for the decomposition of calcium carbonate?CaCO3(s) CaO(s) + CO2(g) kJ

What is the enthalpy of combustion when 1 mol C6H6(g) completely reacts with oxygen?2C6H6(g) + 15O2(g) 12CO2(g) + 6H2O(g)–6339 kJ/mol–3169 kJ/mol1268 kJ/mol6339 KJ/mol

The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C8H18(l) + 12.5O2(g) 8CO2(g) + 9H2O(g).What is the Hf for this reaction?16CO2(g) + 18H2O(g) 2C8H18(l) + 25O2(g) kJ

It is important for scientists to know how much energy is given off or absorbed in a chemical reaction. Which options below would indicate an exothermic reaction?H = –H = + Energy is considered a reactant in the reaction: A + B + energy C + DEnergy is considered a product in the reaction: A + B C + D + energyEnergy is released in the reaction.Energy is absorbed in the reaction.