Thermal decomposition of potassium chlorate produces oxygen and potassium chloride. Calculate the % yield if 35 g of oxygen are collected after heating 100g of KClO3. 2 KClO3 2KCl + 3O2

Answer 1

2KClO₃ ===> 2KCl + 3O₂ ... balanced equation

First, we must find the theoretical yield, then we can calculate the percent yield.

Theoretical yield:

100 g KClO₃ x 1 mol KClO₃/122.55 g x 3 mol O₂/2mol KClO₃ x 32 g O₂/mol O₂ = 39.17 g O₂ = 39 g O₂

Perent yield = actual yield/theoretical yield (x100):

35 g/39 g (x100%) = 89.7% = 90% yield