Question

Calculate the amount of oxygen produced when 1.75 kg of potassium chlorate on heating gives 1.043 kg of
potassium chloride

Answer 1

Hi there,

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According to the equation

2KClO3=> 2KCl + 3O2

So,

2 mol of potassium chlorate produce 3 mol oxygen gas

K atomic mass is 39

Cl atomic mass is 35.5

O atomic mass is 16

KClO3 molar mass is

39+35.5+16×3=122.5 g

O2 molar mass is

16×2=32g

KClO3 sample mass is 1750 g

2mol of KClO3 =3 mol O2

2× 122.5 = 3×32

So

1750 g = ???

Mass of oxygen = 685.7 g

Hope the answer is helpful