Question

Chalk contains calcium,carbon and oxygen in ratio 10:3:12. Find the percentage of carbon in chalk. In a chalk stick the weight of carbon is 3g. What is the weight of chalk stick?

Answer 1

Calcium:Carbon: Oxygen

10:3:12

Total part=10+3+12

= 25

% of carbon = 3/25x100%

=3x100/25%

=3x4%

12%

Given

wieght of carbon = 3g

Now,

we know that carbon is 12% of chalk

3=12% x wieght of chalk

Wieght of chalk=3 x 100/12

=100/4

= 25

So,

The wieght of the chalk is 25g

Answer 2

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