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Dow's Unknown Substance Mystery Lab Report

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Dow's Unknown Substance Mystery 4 unknown substances have been stolen from Dow Inc. The substances are in plastic bags that we cannot open. We were given the task of figuring out what substances were stolen using the electronic balance, the compounds that were provided, and an empty plastic bag. We had to use those items because the Gas Chromatography-Mass Spectrometry was broken and a technician could not come out until next week. Consequently, using the resources provided, we determined that Substance 1 is NaCl, Substance 2 is K2SO4, Substance 3 is Na2CO3, and Substance 4 is NaC2H3O2. Table #1 Substance Number Weight in grams # of Mols Weight in g/mol Substance 1 117.60 g. 2 mol 58.8 g/mol Substance 2 87.71 g. 0.5 mol 175.42 g/mol Substance …show more content…

This is because each substance has two plastic bags to contain the substance. Therefore, if we didn't zero out the scale or figure out the weight of the two empty plastic bags then the weight would not be correct. But because we did weigh the empty plastic bags and zeroed the scales, our weights were correct. After the two empty plastic bags were zeroed out, we started to weigh and record each unknown substance. Which is how we got the weight in grams for the table above. Which was 117.60 grams for substance 1, 87.71 grams for substance 2, 54.7 grams for substance 3, 25.11 grams for substance 4. Once we finished weighing each unknown substance we started figuring out the g/mol mass of each compound that the substances could possibly be, which is how we got to Table #2 above. In order to find the g/mol mass of each of the compounds, we had to find the molar mass of each element, then multiply and add accordingly. I'll use K2SO4 as an example of how to calculate the molar mass of a compound. The elements in K2SO4 are Potassium, Sulfur, and Oxygen. The molar mass of potassium is 39.0983 g/mol, you get the molar mass by looking at the atomic mass on the periodic table, but potassium has a subscript of 2 meaning that there are two potassium atoms in the compound, so we multiply 39.0983 by 2, which equals 78.1966 g/mol. Now let's move on to sulfur, sulfur has a

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