Question

chalk contains 3% of calcium, 12% carbon and 10% of oxygen .find the amount of each of these substance in grams in 2kg of Chalk.

Answer 1

ratio of calcium: carbon : oxygen = 3 : 12 : 10
2kg chalk = 2000gram chalk
for calcium =( 3/25)×2000 = 3×80=240 gram
for carbon =(12/25)×2000=12×80=960gram
for oxygen=(10/25)×2000=10×80=800gram

Answer 2

Amount of chalk=2 kg=2000 g
Amount of calcium=3/100*2000
=60 g
Amount of carbon=12/100*2000
=240 g
Amount of oxygen=10/100*2000
=200 g