7. (i) Chalk contains calcium, carbon and oxygen in the ratio 10:3:12. Find the percentage
of carbon in chalk.
(ii) Ifin a stick of chalk, carbon is 3g, what is the weight of the chalk stick?
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Step-by-step explanation:
We have,
Calcium:Carbon:Oxygen=10:3:12
Then,
Total parts is =10+3+12=25
Now
Carbon%=
total
Carbon
×100
=
25
3
×100
=3×4
=12%
Hence, this is the answer.
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