8. Thermochemistry

Which of the following represents the formation equation for barium nitrate, Ba(NO₃)₂?

Identify a substance that is not in its standard state.

Ibuprofen is used as an anti-inflammatory agent used to deal with pain and bring down fevers. If it has a molecular formula of C₁₃H­₁₈O₂, determine the balanced chemical equation that would give you directly the enthalpy of formation for ibuprofen. 

Which substance has ΔH_f defined as 0 kJ/mol? H₂O(s), Ne(l), F₂(g), CO₂(g).

How many kilojoules of heat will be released when exactly 1 mole of manganese, Mn, is burned to form Mn₃O₄(s) at standard state conditions?

Using Hess's law, calculate the heat of formation for Cao(s) using the following reaction.