## Chemistry and Chemical Reactivity (9th Edition)

a) From the standard states: $Mg(s)+1/2\ O_2(g)\rightarrow MgO(s)$ Enthalpy of formation: $-601.24\ kJ/mol$ b) Enthalpy: $-601.24\ kJ/mol\times 2.5\ mol = -1503.1\ kJ/mol$