Answer:
245 grams of KClO3
Step-by-step explanation:
Lets find the molar mass of KClO3.
Molar mass KClO3 = 122.55 grams/mole.
The molar mass of chlorine is = 35.5 grams/mole.
If we had 1 mole (122.55 grams) of KClO3 it would contain one mole of chlorine atoms, or 35.5 grams of Cl.
The percentage of chlorine in the compound is (35.5g)/(122.55 g) = 0.2897 or 28.97%
Chlorine makes up 28.97% of KClO3
Lets set X to the mass of KClO3, in grams. We can write:
(28.97%)X = 71.0
X = 71.0/(0.2897)
X = 245 grams