Answer to Question #166734 in Physical Chemistry for John

Question

3-ethyl-4-methylhexa-1,3-diene undergoes a combustion reaction. For this reaction, the following 

concentrations were used: [O2] = 0.06 M, [CO2] = 0.09 M and [H2O] = 0.10 M. Determine the 

concentration (in mol/L) used of 3-ethyl-4-methylhexa-1,3-diene if the following thermodynamic 

parameters were determined for the reaction at 25 °C: ΔH = -763.02 kJ/mol and ΔS = -2542.01 J/K 

mol. 

Answer 1

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. The combustion of hydrogen gas produces water vapor. Notice that this reaction also qualifies as a combination reaction.