3 - 12. Find the (a) Chalk contains calcium, carbon and oxygen in the ratio :percentage of calcium in chalk.(b) If in a stick of chalk, carbon is 5 g. what is the mass of the chalk stick?(a) Calcium : carbon : oxygen = 10:3:12Total parts - 10 +3 + 12 - 25Calcium carbon – is and oxygen - 3Percentage of calcium in chalk - * 100% = 40%(b) Percentage of carbon in chalk - 33 * 100 = 12%12% of mass of chalk stick=5 gMass of the chalk stick = 55 1001241.66 $.. Mass of the chalk stick

3 - 12. Find the (a) Chalk contains calcium, carbon and oxygen in t

1.	3 - 12. Find the (a) Chalk contains calcium, carbon and oxygen in the ratio :percentage of calcium in chalk.(b) If in a stick of chalk, carbon is 5 g. what is the mass of the chalk stick?(a) Calcium : carbon : oxygen = 10:3:12Total parts - 10 +3 + 12 - 25Calcium carbon – is and oxygen - 3Percentage of calcium in chalk - * 100% = 40%(b) Percentage of carbon in chalk - 33 * 100 = 12%12% of mass of chalk stick=5 gMass of the chalk stick = 55 1001241.66 $.. Mass of the chalk stick
Answer» 25gExplanation:7b) MASS of the chalk =CARBON WEIGHT=3 gpercent of carbon in chalk =12%12% of x = weight of carbon=12/100x=312x/100=3x=3100/12=25 g