A sample of C3H8 has 6.96 * 1024 H atoms. How many carbon atoms does the sample contain?

A sample has 3.28 X 10^24 h atoms

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