If 12.5 g of copper are reacted with an excess of chlorine gas, then 25.4 g of copper(I) chloride, CuCh (s), are obtained.

Question

Calculate the theoretical yield and the percent yield.

Answer 1

To calculate the theoretical yield, we first need to determine the molar mass of CuCl.

1. Find the molar mass of copper (Cu):
- Cu: 63.55 g/mol

2. Find the molar mass of chlorine (Cl):
- Cl: 35.45 g/mol

3. Add the molar masses of Cu and Cl to find the molar mass of CuCl:
- CuCl: 63.55 + 35.45 = 99.00 g/mol

4. Calculate the moles of Cu used:
- Moles of Cu = 12.5 g / 63.55 g/mol = 0.197 mol

5. Use the mole ratio between Cu and CuCl from the balanced chemical equation to find the theoretical yield of CuCl:
- Cu + Cl2 -> CuCl
- 1 mol Cu : 1 mol CuCl
- Theoretical yield of CuCl = 0.197 mol Cu * 1 mol CuCl / 1 mol Cu = 0.197 mol

6. Calculate the theoretical yield of CuCl in grams:
- Theoretical yield of CuCl = 0.197 mol * 99.00 g/mol = 19.50 g

To calculate the percent yield, we use the actual yield of CuCl obtained (25.4 g) and the theoretical yield calculated (19.50 g).

7. Calculate the percent yield:
- Percent yield = (actual yield / theoretical yield) * 100%
- Percent yield = (25.4 g / 19.50 g) * 100% = 130.26%

Therefore, the theoretical yield of CuCl is 19.50 g and the percent yield is 130.26%.