14. Show all of your work for each of the following problems. An aluminum nail o

Question

14. Show all of your work for each of the following problems. An aluminum nail of mass 5.00g is immersed into a solution of copper(II)nitrate. The mass of copper(II)nitrate in the solution is 6.50g. a. Write the balanced chemical equation for the reaction. b. What is the limiting reactant? c. How many grams of elemental copper can be produced from the reaction? d. How many grams of excess reactant remains when the limiting reactant is consumed? e. What is the % yield if 1.95g of copper is produced from the reaction in the lab?

Explanation / Answer

a) 2Al + 3Cu(NO3)2 ---->3 Cu + 2Al(NO3)3 b) limiting reactant = Cu(NO3)2 c) copper nitrate moles = 6.5/187.56 = 0.03465 moles of Cu produced = 0.03465 , mass of Copper = 63.546 x0.03465 = 2.2 gms elemental copper produced = 2.2 gm d) moles of Al left = (5/26.98) -0.03465 =0.1506 excess Al in gm = 0.1506 x26.98 =4.065 gm e) % yield = (1.9/2.2) x100 = 86.36 %

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