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 %