High School

Which of the following is the mass of oxygen produced when 100.0 grams of potassium chlorate is heated?

A. 39.4 grams
B. 49.4 grams
C. 59.4 grams
D. 69.4 grams

Answer :

Final answer:

When 100.0 grams of potassium chlorate is heated, the mass of oxygen produced is 48.0 grams.

Explanation:

To find the mass of oxygen produced when 100.0 grams of potassium chlorate is heated, we need to use the balanced chemical equation for the decomposition of potassium chlorate (KClO3): 2 KClO3 → 2 KCl + 3 O2

From the equation, we can see that for every 2 moles of KClO3 that decompose, 3 moles of O2 are produced.

Using the molar mass of KClO3 and O2, we can calculate the mass of O2 produced:

100.0 g KClO3 x (3 moles O2 / 2 moles KClO3) x (32.00 g O2 / 1 mole O2) = 48.0 g O2

Therefore, the mass of oxygen produced when 100.0 grams of potassium chlorate is heated is 48.0 grams.

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