Question

A wedding ring presented to a bride contains $788\, mg$ of gold and the rest is diamond. If the weight of ring is $1$ gram, the bride receives, (atomic wt. of $Au = 197$, $C = 12$)

• A. More number of gold atoms
• B. More number of carbon atoms
• C. Equal number of gold and carbon atoms
• D. Gold and carbon atoms are in the ratio of 4 : 1

Answer 1

Answer: (B)

More number of carbon atoms

Answer 2

Weight of gold $= 0.788\, g$ Number of moles $= \frac{0.788}{197} = 0.004$ Weight of diamond or carbon $= 1 - 0.788- 0.212 \,g$ Number of moles $= \frac{0.212}{12} = 0.01766$