Question

How many moles of carbon in 130g of C2H6

Answer 1

so the easiest way to do this is to use the train tracks and work through the components
you know you have C2H6 so you have to find the total mass of that which you find by adding all components and their weights from the periodic table
Carbon = 12.0107 Hydrogen = 1.00794
12.0107(2)+1.00794(6) = total for C2H6

Answer 2

you also need to know the mole ratio C2 + H6 = C2H6
so for every 1 mole of C2H6 you have 2 moles of C and 6 moles of H

Answer 3

once you do that you are able to set up the math