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
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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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.