Question

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?​

Answer 1

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.