Potassium chlorate (used in fireworks, flares, and safety matches) forms oxygen and potassium chloride when heated. KClO3 (s) → KCl (s) + O2 (g) [unbalanced] How many grams of oxygen are formed when 26.4 g of potassium chlorate is heated?

10.3 g of oxygen are formed when 26.4 g of potassium chlorate is heated

Explanation:

This is the balanced equation:

2KClO₃ (s) → 2KCl (s) + 3O₂ (g)

Ratio beteween the salt and oxygen is 2:3

Molar mass of KClO₃ = 122.55 g/m

Let's find out the moles of salt

Mass / Molar mass

26.4 g / 122.55 g/m = 0.215 moles

So, this is the final rule of three:

If 2 moles of KClO₃ make 3 moles of oxygen

0.215 moles of KClO₃ make (0.215.3) / 2 = 0.323 moles of O₂ are produced

Molar mass O₂ = 32 g/m

Moles. molar mass = mass

0.323 m. 32g/m = 10.3 g