1 mol of carbon-12 contains 6.022x10^23 carbon-12 atoms with a mass of 12 g.

Question

1 mol of carbon-12 contains 6.022x10^23 carbon-12 atoms with a mass of 12 g.

Calculate the number of moles of carbon-12 atoms in 20.0 g of carbon-12

Answer 1

There are 1.67 moles of carbon-12 atoms in 20.0grams of carbon-12. 12 grams or the molar mass tells you the mass of one mole of that element, in this case carbon-12. If we are given 20 grams of this element then we simply divide 20/12 to get the number of moles. Hope this helps!