so first we will find the moles of Hydrogen by putting values in formula that is . moles = no. of atoms/ Avogadro's no (NA) moles = 5.446 we got this now the ratio of Carbon and Hydrogen is: C = H 3 = 8 now multiply it with the moles 3/8 * 5.466 = 5.466 2.05 is the moles of C . now:find the no of C atoms by this = moles X NA = 2.05 X 6.022 X 10^23 = 1.27 X10^2 now will find the mass of sampl: so One mole of C3H8 = 3 moles of C 1/3 * 2.05 = 2.05 moles of C 0.68 moles of C3H8. now the mass of C3H8 = moles X molar mass mass of C3H8 which is = 0.68 X 44 = 30.2 grams of C3H8
