Question

Consider a 12.01 g sample of carbon. the average mass of a carbon atom is 1.994 3 10223 g. how many carbon atoms are in the sample?

Answer 1

the mass of a carbon atom is 1.994 x 10⁻²³ g
the mass of the carbon sample is 12.01 g
to find the number of Carbon atoms we have to divide the mass of sample by mass of a carbon atom.
number of C atoms =
`(12.01 g)/(1.994* 10^(-23)g )`
therefore number of atoms = 6.023 X 10²³ atoms of carbon