The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 2.50 g of butane?

Answer 1

well, how many moles in 2.5g of Butane?

then the # of carbons (4 per molecule) is

#moles * 4 * 6.023*10^23

Answer 2

1.035 * 10^23 atoms of C