Question

The percentage of carbon in a 55 % pure sample of carbon carbonate is
(Ca=40, C=12, O=16)

• A. 12 %
• B. 5.5 %
• C. 4.5 %
• D. 6.6 %

Answer 1

Answer: (D)

6.6 %

Let mass of sample is 100 gm, mass of $CaC{O}_3=55gm$
mass of C $=12\times \frac{55}{100}=6.6gm$
So % of C in sample $=6.6$ %.