# Problem: A mixture of KClO3 and KCl with a mass of 0.950 g was heated to produce O2. After heating, the mass of residue was 0.700 g. Assuming all the KClO3 decomposed to KCl and O2, calculate the mass percent of KClO3 in the original mixture.

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###### FREE Expert Solution

We are asked to calculate the mass percent of KClO3 in the original mixture.

Step 1. Calculate mass O2 produced

2  KClO3 → 2 KCl + 3 O2

KCl → residue

Mass Mixture = Mass KClO3 + Mass KCl

Mass Mixture = (Mass KCl + Mass O2) + Mass KCl

Mass Mixture = (Mass KCl + Mass KCl) + Mass O2

Mass Mixture = (Mass Residue) + Mass O2

Mass O2 = Mass Mixture - Mass Residue

Mass O2 = 0.950 g - 0.700 g

Mass O2 = 0.250 g ###### Problem Details

A mixture of KClO3 and KCl with a mass of 0.950 g was heated to produce O2. After heating, the mass of residue was 0.700 g. Assuming all the KClO3 decomposed to KCl and O2, calculate the mass percent of KClO3 in the original mixture.