Question

A chalk contain 10 percent calcium,3 percent carbon and 12 percent oxygen find the amount (in gram)of each of these compounds in 1kg of chalk

Answer 1

Calcium in grams=10% of 1 kg
=10% of 1000 g
=(10*1000)/100=100 grams

Carbon=3% of 1000g=30g

Oxygen=12% if 1000g=120g