# Bytco College

Calculate the volume of O2 evolved &mass of KCl formed by decomposition of 30.8 gm KClO3

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1. 30.8g = 0.251 moles KClO3

You can see from the reaction

2KClO3 = 2KCl + 3O2

that 1.5 moles of O2 are released for every mole of KClO3. So, you have 0.377 moles of O2.

You know that at STP 22.4 moles of a gas occupy 22.4L of volume.

You can finish it off, right?

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