Use the following reaction: 2KClO3 -> 2KCl + 3O2 If 5.0g of KClO3 is decomposed, how many grams of KCl are produced?

Question

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Answer 1

Hello, Andrew,

We need a balanced equation for the decomposition of KClO₃. I believe the following works:

2KClO₃ = 2KCl + 3O₂

The molar ratio of KCl to KClO₃ is 2/2, or 1. When we decompose 1 mole of KClO₃ we get 1 mole of KCl.

5.0 grams of KClO₃ is 5.0 grams/*122.55 g/mole), or 0.0408 moles KClO₃. That means we'll make 0.0408 moles of KCl, according the equation. Convert that to grams by multiplying by the molar mass of KCl. I get 3.04 grams.

Bob