Consider stoichiometric StraightPhi 1 combustion of tetraeth

Consider stoichiometric (StraightPhi= 1) combustion of tetraethyl lead (2(C2H5)4Pb) and air. Balance an appropriate chemical formula for this combustion assuming PbO(s) (solid lead oxide) is produced in addition to the typical CO_2 (g) and H_2O (I) emissions. Calculate the heating value (in kJ/kg) assuming water is in liquid form and using the heat of formation data from textbook or Canvas thermos link. Use 53 kJ/gmol for tetraethyl lead heat of formation, in liquid form. Use -219 kJ/gmol for lead oxide heat of formation, in solid form. Calculate the Air-Fuel Ratio for lead as a fuel. Would an engine see an increase in power by using lead instead of isooctane? Assume no change in thermal efficiency, engine speed, or volumetric efficiency.

Solution

a)

2 Pb(C₂H₅)₄ + 17 O₂ = 2 PbO + 16 CO₂ + 2 H₂O

d)

Yes it will increase the power of the engine by using lead instead of isooctane. As lead is considered as low toxicity octane booster but some antiknock agents are added to give better performance. Thats why it is not used much because in Iso octane no antiknock agent is need to be added. But Lead give more power than isooctane.