Oxygen gas can be produced in the laboratory by the decomposition of potassium c

Question

Oxygen gas can be produced in the laboratory by the decomposition of potassium chlorate upon heating under the proper conditions:

2 KClO3(s) -> 2 KCl(s) + 3 O2(g)

Suppose a 1.00g sample of KClO3 is heated, and 0.21 gram of oxygen gas was collected
as a result of decomposition. What is the percent yield of the reaction?

Explanation / Answer

=> 208.2 g of PCl5 are expected to form from 70.91g Cl2 when the % yield is 100%. => when the % yield is 100% , 61.3 g of Cl2 will form 208.2*61.3/70.91 = 179.984 g PCl5 but here 119.3 g of PCl5 is formed. => % yield = 119.3*100/179.984 = 66.284%

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