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Homework Help: Help for grade 11 chem questions

  1. Jan 6, 2009 #1
    Hi I have two questions grade 11 chem questions that I dont know how to do. HELP PLEASE!

    Q1: Tetraethyl( Pb(C2H5)4 ) lead was added to gasoline up to 2.0ml per 3.8L of gasoline.

    a)Calculate the mass of Tetraethyl lead in the total amount of gasoline that you use for this trip (31.2 L of gasoline). The density of Tetraethyl lead is 1.653g/mL

    b) Calculate the mass of elemental lead in the total amount of gasoline that you will consume for this trip.

    I'm not sure but here is what I did.
    Mass tetraethyl lead = 31.2 L gasoline * (2.0 mL Pb(C2H5)4/3.8 L gasoline) * 1.653 g Pb(C2H5)4
  2. jcsd
  3. Jan 7, 2009 #2


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    Staff: Mentor

    Looks correct. Well, almost correct - not all units are OK. But that's a minor problem.

    b is about using molar masses.
  4. Jan 7, 2009 #3
    Yeah thanks for the help... I got the question like 12 mins after posting thanks for your help tho.
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