1 mol of carbon-12 contains 6.022 x 1023 carbon-12 atoms with a mass of 12 g.

Question

1 mol of carbon-12 contains 6.022 x 1023 carbon-12 atoms with a mass of 12 g.

A. Calculate the mass of one carbon-12 atom. Express your answer using scientific notation.
B. Calculate the number of carbon-12 atoms in 20.0 g of carbon-12.
C. Calculate the number of moles of carbon-12 atoms in 20.0 g of carbon-12.

Answer 1

A. Mass of one carbon-12 atom =12g/ (6.022x10²³) = 1.9927x 10^-23 g

 

 

B. Number of Carbon-12 in 20 g = 20/12 x 6.022 x 10²³ = 1.00366 x 10²⁴

 

 

C. Number of moles of C-12 in 20 g = 20/12= 1.6666