How many carbon atoms are there in a 1.5-carat diamond? diamonds are a form of pure carbon. (1 carat=0.20 grams) ?

1 carot = 0.2 grams

1.5 carot = 0.3 grams.

1 mol of Carbon = 12 grams

x mol = 0.3 grams

0.3 * 1 = 12 x

x = 0.3/12

x = 0.025 mol

1 mol of Carbon is 6.02 * 10^23 atoms

0.025 mol of carbon is x

1/0.025 = 6.02*10^23 * / x

x = 0.025 * 6.02 * 10^23

x = 1.5 * 10^22 atoms of carbon.