163k views
1 vote
A pure sample of KClO₃is found to contain 71.0 grams of chlorine atoms. What is the mass of the sample? o 245g o 170g o 122 g o 209g

User Nubinub
by
7.8k points

1 Answer

6 votes

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

User Phineas
by
8.5k points