If the decomposition of a sample of KClO3 produces 3.29 g of O2 , what was the mass (g) of the original sample?

Thus 8.41 g was the mass of the original sample

Explanation:

To calculate the moles :

According to stoichiometry :

As 3 moles of are produced by = 2 moles of

Thus 0.103 moles of are produced by =  of

Mass of

Thus 8.41 g was the mass of the original sample.

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