Question

Tetraethyl lead, pb(c2h5)4, has been used as a petrol additive. What is the percentage by mass of carbon in tetraethyl lead? (average mass (ar) of lead =

Answer 1

Relative formula mass of tetraethyl lead = 207 + ( 24 + 5)4 = 323

So the mass of carbon in this case is (12 x 2)4  = 96

The the pecentage by mass of carbon in tetraethyl lead is given by;

= 96/323 x 100 = 29.7%.

So the reason as to why tetraethyl lead is normally added to petrol is to increase the octane rating of the fuel. This ensures that the fuel burns efficiently without causing knocking of the engine.

Answer 2

Answer:

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