Data: Mass (g) A) Empty 250-mL beaker ll 7 65 B) Solid CuCl2 C) Fe nail before t

Question

Data: Mass (g) A) Empty 250-mL beaker ll 7 65 B) Solid CuCl2 C) Fe nail before the reaction D) Fe nail after the reaction 2.5S 23 E) Decrease in nail mass (Calculate Instructor's initials: 201 F) Beaker with solid copper I 17 G) Solid copper produced (calculate) Data Analysis SHOW YOUR WORK for all calculations woRK ALONE on calculations Part A: 1. write a balanced chemical equation, assuming that the iron was oxidized to iron (lll). Include phases. Use this equation for calculations 2-5. 2. Model #1: Based on the masses of the starting materials (lines B and C), what is the theoretical yield of copper? 3. Based on the theoretical yield from problem #2, calculate the percent yield of copper: 4. Calculate the number of grams of the excess reactant that should be left over:

Explanation / Answer

1. 2Fe + 3CuCI2 >>> 2 FeCI3 + 3Cu+

2. no of moles of solid CuCI2 = 1.28/134.45 g ( mol wt) = 0.0052

Fe (ll)= 2.760/71.844 = 0.03842

solid CuCl2 becomes the limiting reagent. so no of moles limiting reagent= moles of copper produced

theoretical yeild= moles of copper x molar mass of copper

= 0.00952 x 63.546

= 0.604

percent yeild = actual yield / theoretical yeild x 100 %

0.29/0.604 x 100

= 48 %

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