Question

chalk contains 10% calcium 3% carbon and 12% oxygen find the amount in grams of each of these compound in 1 kg of chalk

Answer 1

----------------------------------------

Here is the solution:

----------------------------------------

Weight of the chalk = 1 kg = 1000g

10% calcium = 10% of 1000g = 0.1 x 1000 = 100g

3% carbon = 3% x 1000g = 0.03 x 1000 = 30g

12% oxygen = 12% x 1000g = 0.12 x 1000 = 120g

Answer: 1 kg of chalk has 100g of calcium,  30g of carbon and 120g of oxygen.

Answer 2

weight of caco3 is 100g....
so, ca is 10g
C is 3g
O2 is 12g...
now in 1000 g
ca is 100g
C is 30g
O2 is 120g...