Question

How many atoms of carbon are present in a diamond weighing 0.5 carat? (one carat weighs 200 mg and assume diamond to be pure carbon)

Answer 1

wt . of carbon in 0.5 carat = 0.5 × 200 × 10-3 gm

= 0.1 gm

now as we know that 12 gm of carbon have 6.02 × 1023 no. of carbon atoms

therefore 0.1 gm of carbon have 0.5 × 1022 no. of carbon atoms

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Answer 2

See attachment.

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