Does 1L of Petrol Contain 790g of Heptane?

[supernova1203]

The course book tells us that 1 L of gasoline(heptane) has the density of 790g/L

which it says, means that, 1 L of petrolium has a mass of 790g.
At this point i made the assumption that 1L of petrolium has a 790g of heptane.
I did this because 1L weighs 1kg

I then used it in my calculations(stoichiometry) to determine how much CO2 is produced by 1L of gasoline, answer came out to be the same as the book, at 2.4kg

my question is, does the speculation i used in determining that 1L of petrolium has 790 g of heptane make sense? Given the fact that the book states 1L of petrolium weighs 790g(rather confusing statement as far as I am concerned)

 

[Borek]

I don't see where your problem is. Density of 790g/L MEANS that 1L weights 790g. There is nothing to assume here.

You assumed that gasoline is a pure heptane, which is not exactly correct, but relatively close to the reality.