Calculate the number of moles of aluminum that you used. Show your calculations:

Question

Calculate the number of moles of aluminum that you used. Show your calculations: __________ moles Al Calculate the molar mass of alum: ________________ g/mole Noting that one aluminum atom is in each formula unit of alum, we know that each mole of aluminum will give rise to one mole of alum. Based on the number of moles of aluminum you used, calculate the maximum number of grams of alum that you could produce (theoretical yield), and assuming that aluminum is the limiting reagent: (show your work) _______________ g alum Using the number of grams of alum that you actually obtained, calculate the percent yield of alum you synthesized: (Show your work) _________%

Explanation / Answer

Al to alum formation

mass of Al used = 0.561 g

moles of Al used = 0.561/27 g/mol

                            = 0.021 mol

Theoretical moles of Alum produced = 0.021 mol

theoretical mass of alum produced = 0.021 mol x 474.4 g/mol

                                                        = 9.962 g

percent yield of alum = 8.95 g x 100/9.962 g

                                  = 89.84%

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