What is its empirical formula isooctane?

Answer 1

I don't know the exact formula but, i know the density of iso-octane: 0.69 g/ml

And one gallon is equal to 3,840 ml so.... all you need is the volume.

Answer 2

The empirical formula is C8H18; the structural formula I'm not going to attempt to draw here but you should be able to figure it out from the IUPAC name: 2,2,4-trimethylpentane.

Answer 3

Octane and iso-octane both have the molecular formula C8H18, so empirical formula is C4H9.

Answer 4

The empirical formula of isooctane is C8H18, as it shows the simplest ratio of elements present.