Question

the star of Africa, a diamond in the royal scepter of the British crown jewels, has mass of 530.2 carats, where 1 carat = 0.20 g. given that 1 kg has a weight of 2.21 Ib, what is the weight of the star of Africa in pounds

Answer 1

Given:
Mass of the diamond = 530.2 carats
1 carat = 0.20 g = 0.20 x 10⁻³ kg
1 kg = 2.21 lb

Therefore the mass of the diamond is
$(530.2 \, carats)*(0.20 \times 10^{-3} \, \frac{kg}{carat})*(2.21 \, \frac{lb}{kg}) = 0.2343 \, lb$

Answer: 0.2343 lb