Density HELP!?

Question

The volume of a diamond is 2.8 mL. The density of the diamond is 3.51 g/cubic cm. So if 1 carat=0.200 g, What is the mass of the diamond in carats?

Please help! (This is for summer chemistry work)

Answer 1

d=m/v so m=d x v so the mass is 9.828 so then divide that by .2 and the carats is 4.914 and i want that diamond

Answer 2

m=dv

m=3.51 g/cm^3 * 2.8ml

m=9.828g                          [1cm^3 = 1ml]

9.828g * 1carat/0.200g = 49.14carat   [that's a nice ring!]