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Molar Mass Of Benzoic Acid Lab Report

448 Words2 Pages

As mentioned earlier, the molar mass of benzaldehyde is 106.121g/mol, and the molar mass of benzoic acid is 122.12g/mol. With that in mind, to calculate the maximum possible mass of benzoic acid, which is the product of the experiment, Equation #2 must be used. Referencing from Table 1.1, the observed benzaldehyde mass is 5.02g, thus the plugging that into Equation #2, the calculation would be, (122.12 g⁄mol C_7 H_6 O_2)/(106.121 g⁄mol C_7 H_6 O)×5.02g, equaling to, 5.78g±0.01g of benzoic acid. To calculate the percentage yield, Equation #1, would be used, and the observed mass of benzoic acid, as stated in Table 1.1, is 5.68g, with the maximum benzoic acid possible to be 5.78g, as calculated using Equation #2. Thus, Equation #1 with the key information would look the following, 5.68g/5.78g×100%, equaling to a 98.3% yield, as shown in Table 2.1. …show more content…

Both the mass of benzoic acid and the mass of benzaldehyde have a mass error of ±0.01g, therefore, to calculate the percent error is by, ((0.01g/5.68g)+(0.01g/5.78g))×100%, equaling 0.3% error for the result. Converting the percent of percent yield to percent yield, the formula is the calculated percent error of the result divided by 100%, multiplied by the percentage yield. Therefore, 98.3%×((0.3%)/(100%)), equals to 0.2%, as demonstrated in Table 2.1, thus the final answer for the percent yield of benzoic acid is 98.2%±0.2%

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