Question

A student working in the laboratory produces 6.81 grams of calcium oxide, CaO, from 20.7 grams of calcium

carbonate, CaCO3, according to the reaction CaCO3 → CaO + CO2. Calculate the theoretical yield and
the percent yield for the reaction. Show and/or explain your work.

Answer 1

Percent yield = 57.8 %

Theoretical yield = 11.781 g

Step-by-step explanation:

Given data:

Mass of CaO produced = 6.81 g

Mass of CaCO₃ react = 20.7 g

Theoretical yield = ?

Percent yield = ?

Solution:

Chemical equation:

CaCO₃ → CaO + CO₂

Number of moles of CaCO₃ :

Number of moles = mass/molar mass

Number of moles = 20.7 g/ 100.1 g/mol

Number of moles = 0.21 mol

Now we will compare the moles of CaCO₃ with CaO.

CaCO₃ : CaO

1 : 1

0.21 : 0.21

Theoretical yield of CaO:

Mass = number of moles × molar mass

Mass = 0.21 mol × 56.1 g/mol

Mass = 11.781 g

Percent yield:

Percent yield = ( actual yield / theoretical yield ) × 100

Percent yield = (6.81 g/ 11.781 g) × 100

Percent yield = 57.8 %