Question

KClO3 decomposes according to the reaction below. How many grams of KClO3 are needed to produce 826ml of O2 at standard temperature and pressure?

2KClO3 → 2KCl + 3O2
Use PV = nRT and solve for n = mols.
Convert mols O2 to mols KClO3 using the coefficients in the balanced equation. then grams KClO3 = mols KClO3 x molar mass KClO3.

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