Question

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7th Class Question:

Chalk Contains 10% Of Calcium,3% Of Carbon And 12% Of Oxygen. Find The Amount Of Carbon And Calcium (In Grams) In Two Wholes One Up On Two.

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Answer 1

Amount of each compound in 1kg Chalk:

i) Calcium = 100 grams

ii ) Carbon = 30 grams

iii ) Oxygen = 120 grams

Step-by-step explanation:

Given Chalk contains

10% of calcium ,

3% of oxygen,

12% of oxygen

Now ,

1kg of of chalk contains :

i )Calcium

= 10% of 1kg

= 10% x 1000 grams

= 10/100X1000 grams

= 100 grams

ii )Carbon

=3% of 1kg Chalk

= 3% x 1000 grams

= 3/100 X 1000

= 30 grams

iii) Oxygen

=12% of 1kg

= 12% x 1000 grams

= 12/100X 1000 grams

= 120 grams

Therefore,

Amount of each compound in 1kg Chalk:

i) Calcium = 100 grams

ii ) Carbon = 30 grams

iii ) Oxygen = 120 grams

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