Question

Q.16. 1) Chalk contains calcium , carbon and oxygen in the ratio 10 :3 : 12.
Find the percentage of carbon in chalk. 2.if in a stick of chalk carbon is 3 g what is the weight of the chalk sticks
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Answer 1

Answer:

1.12%

2.25g

Answer is in the above images.

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Answer 2

Step-by-step explanation:

Sum=10+3+12

=25

% of carbon = 3/25×100

= 12%

Let chalk weight be n

12% of n= 3g

12/100×n=3

n= 3÷12/100

= 25g

So, Answer obtained is 25g

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