Question

Post a chemical reaction and describe its use. Provide the Enthalpy of the reaction and explain how you calculated it. Look up the enthalpy of formation for the products and the reactants. Name the reactants and the products.

Answer 1

Combustion reaction of Methane:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) ΔH^o_reaction =...........

Formula:

ΔH^o_reaction= ∑ΔH^o_f {products} −∑ΔH^o_f {reactants}

ΔH^o_f {CH₄(g)}=−75 kJ/mol............methane

ΔH^o_f {O₂(g)}=0 kJ/mol...............oxygen

ΔH^o_f {CO₂(g)}=−394 kJ/mol................carbon dioxide

ΔH^o_f {H₂O(g)}=−284 kJ/mol.....................water

∑ΔH^o_f {products} = ΔH^o_f {CO₂(g)}+ΔH^o_f {H₂O(g)} =(1)(−394)+(2)(−284)=−962 kJ/mol

∑ΔH^o_f {reactants}=ΔH^o_f{CH4(g)}+ΔH^o_f{O2(g)}=(1)(−75)+(2)(0)=−75 kJ/mol

ΔH^o_reaction=∑ΔH^o_f{products}−∑ΔH^o_f{reactants}=(−962)−(−75)=−887 kJ/mol