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# Chemistry: Percent Composition Lab Introduction Essay

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Percent Composition Lab Introduction
The percentage of something is very important in everyday life. For example, a farmer would want to know the percentage of nutrients in a fertilizer they are using. In spring, the farmer may want to use a fertilizer that has a high percentage of nitrogen, because it "greens” plants. In the fall, the farmer may want to use a fertilizer that has a higher percentage of potassium, because it strengthens the root systems of plants. A way to find the percentage of nutrients is by using percent composition.
Percent composition is the percent of the total mass of a compound that an element takes up (Texas A&M University, "Chemistry"). To calculate the percent composition of element of a compound, the molar mass of the compound must be found by adding up the masses of each atom in the compound (Texas A&M University, "Chemistry"). This can be done by using a periodic table. Then the mass of the element must be calculated by adding up the mass of its atoms (Texas A&M University, "Chemistry"). Then the mass of the element must be divided by the total molar mass of the compound and then be multiplied by 100 (Texas A&M University, "Chemistry"). For example, the percent composition of sodium (Na) and chlorine (Cl) in sodium chloride (NaCl) are 39.34% and 60.66%. These were found by calculating the molar mass of NaCl, which would be 22.99g/mol of sodium (Na), plus 35.45g/mol of chloride (Cl), which equals 58.44g/mol of NaCl. The total mass of sodium (Na), 22.99g/mol, was then divided by the molar mass of sodium chloride (NaCl), 58.44g/mol and then multiplied by 100, equaling a percent composition of about 39.34% of sodium (Na) in sodium chloride (NaCl). The total mass of chloride (Cl), 35.45g/mol, was then div...

... middle of paper ...

...ntahydrate is (CuSO 4 ) 5(H 2 O). The molecular formula of copper (II) sulfate pentahydrate is also (CuSO 4 ) 5(H 2 O).

Works Cited
Bailey, Dr. Kristy M. "Stoichiometry Tutorial Finding Molar Mass". Oklahoma City Community College. Web. March 17, 2014.
Chabay, Ruth; Kean, Elizabeth; Jones, Loretta; Rogers, Elizabeth; Smith, Stanley; Stovall, Iris. Fundamentals of Chemistry. University of Wisconsin-Madison, 2000. Web. March 17, 2014.
De Leon, N. "Molar Mass (Molecular Weight)". Indiana University Northwest. Web. March 17, 2014.
Department of Chemistry. "The Mole and Molar Mass". The University of Memphis, 2013. Web. March 17, 2014.
Iowa State University. "Material Safety Data Sheet Copper (II) Sulfate Pentahydrate". Iowa State University, July 9, 1999. Web. March 17, 2014.
Texas A&M University. "Chemistry". Texas A&M University. Web. March 17, 2014.

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