Mass of oxygen = mass of sample – (mass of carbon plus mass of hydrogen) To determine the mass of oxygen, we will subtract the combined masses of carbon and hydrogen from the mass of our compound (sample). How would we determine the mass of oxygen? Now, imagine that we burned an organic compound that also contained oxygen. These chemicals then travel to the second compartment, where water is absorbed, and into the third compartment where carbon dioxide is absorbed. The first compartment is the furnace, where you burn your sample to generate carbon dioxide and water. Here is a simplified illustration of the instrument used in combustion analysis: Burning an organic compoundĪs you can see, the instrument has three separate compartments that are all connected to one another. Next, we use the mass of carbon dioxide to calculate the mass of carbon in the original compound and the mass of water to calculate the mass of hydrogen in the original compound. To determine the mass of carbon dioxide, we subtract the mass of the CO 2 absorber before burning from the mass of the CO 2 absorber after burning.
To determine the mass of water, we subtract the mass of the water absorber before burning from the mass of the water absorber after burning. Once the burning is complete, we weigh the carbon dioxide absorber and the water absorber. While the water produced as a result of the burning is absorbed by magnesium perchlorate. The carbon dioxide produced as a result of the burning is absorbed by sodium hydroxide. In combustion analysis, we usually burn an organic compound in oxygen to convert the carbon in the compound to carbon dioxide and the hydrogen to water.
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