The Law of Definite Proportion The law of definite p

The law of definite proportion states that different samples of a pure compound always contain the same elements in the same proportions by mass (Law, 2005). For example, sodium chloride always contains 39.3% sodium and 60.7% chlorine by mass. In this experiment, a sample of potassium chlorate was thermally decomposed to determine the mass percent of oxygen in the compound.

A crucible containing 0.1g MnO2 catalyst was weighed, and 20g KClO3 was added, and the crucible and contents reweighed. A thermometer was placed in the crucible, and the crucible heated with a Bunsen burner (Manganese, 2005; Potassium, 2005). The crucible was

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