Table 1 : Mass Compound Mass (g) Copper Gluconate 1.9g Copper 0.6g Table 2 : Giv
ID: 527587 • Letter: T
Question
Table 1: Mass
Compound
Mass (g)
Copper Gluconate
1.9g
Copper
0.6g
Table 2: Givens
Name
Given
Copper Gluconate Formula
C12H22CuO14
Molecular Weight of C
12.011 g/mol
Molecular Weight of H
1.008 g/mol
Molecular Weight of O
15.999 g/mol
Molecular Weight of Cu
63.546 g/mol
Table 3: Unknowns
Unknowns
Post-Lab Questions
What is the mass of the gluconate? Include your calculations
Determine the number of moles of copper in the copper gluconate using your results.
What is the chemical formula of copper gluconate? Use the givens and unknowns in Table 2 and Table 3 to solve. Include your calculations. Hint: In the unknown equations (Table 3), the subscript is the number of atoms in the chemical formula and the element letters are the molecular weights.
List two sources of error in the experiment and explain the impact they had on the results.
Create a bar graph showing the percent composition of each element in copper gluconate. Construct your graph on a computer program such as Microsoft Excel®. If you do not have a graphing program installed on your computer, you can access one on the internet via the following links: http://nces.ed.gov/nceskids/createagraph/ or http://www.onlinecharttool.com. Clearly label each element and the percentage.
Compound
Mass (g)
Copper Gluconate
1.9g
Copper
0.6g
Explanation / Answer
Molecular formula of gluconate = C12H22CuO14
Gluconate contains 12 atoms of Carbon, 22 atoms of H and 14 atoms of O.
Mass of gluconate = 12 * 12.011g/mol + 22* 1.008g/mol + 14* 15.999 g/mol
= 390.294 g/mol
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moles of Cu = mass of Cu/ molar mass of Cu = 0.6gm/63.546g/mol = 9.44*10^-3 moles
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Molecular formula of Copper gucothionate = C12H22CuO14
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