Question

(i) Chalk contains calcium, carbon and oxygen in the ratio 10 : 3 : 12. Find the percentage of carbon in chalk.
(ii) If in a stick of chalk, carbon is 3 g, what is the weight of the chalk stick?


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Answer 1

Step-by-step explanation:

i ) Total of parts = 10 + 3 + 12 = 25

Percentage of carbon in chalk

• 3/25 × 100% = 12%

Hence, 12% carbon in the chalk.

ii ) Let the weight of the chalk stick of chalk be P. Then, 12% of P is 3

• 12/100 × P = 3
• P = 3×100 / 12 = 25 g
• P = 25 g

Hence, the weight of the chalk stick is 25g.

hope it helps you.

Answer 2

Answer:

(i) Percentage of carbon in chalk = 3/25 × 100 = 12%.

(ii) 12/100 * P = 3.

P = 3 * 100/12 25g.

P = 25g.

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