Mass (g) A) Empty 250-mL beaker B) Solid CuCla C) Fe nails before the reaction D
ID: 941889 • Letter: M
Question
Mass (g) A) Empty 250-mL beaker B) Solid CuCla C) Fe nails before the reaction D) Fe nails after the reaction E) Decrease in nail mass (calculate) F) Beaker with solid copper G) Solid copper produced (calculate) Data Analysis 2 0460 .szq 0-193 16 Instructor's initials: 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 (h, 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 overExplanation / Answer
mass of iron before reaction = 2.046 grams
mass of iron after reaction = 1.8529 grams
decrease in nail mass = 0.1931 grams
No of mol of CuCl2 = 1.66/134.4520 = 0.0123 mol
No of mol of Fe = 0.1931 / 56 = 0.00345 mol
part A
1. CuCl2(aq) + Fe(s) -----> FeCl2(aq) + Cu(s)
2. No of mol of Fe = 0.00345 mol
No of mol of Cu produced = 0.00345 mol
mass of Cu = 0.00345*63.5 = 0.22 grams
theoretical yield = 0.22 grams
practical yield form data = 0.14 grams
percent yield = 0.14/0.22*100
= 63.63%
excess reagent is CuCl2
No of mol of excess CuCl2 = 0.0123-0.00345
= 0.00885 mol
mass of cucl2 = 0.00885*134.4520 = 1.19 grams