Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide. CaCO₃(s) → CaO(s) + CO₂(g). (a) 8.000g of CaCO₃ was heated strongly for about 10 minutes. 6.213g of solid remained. Calculate the mass of carbon dioxide gas given off. (b) A second sample of calcium carbonate is strongly heated in a crucible until there is no further loss in mass. The mass of calcium oxide remaining in the crucible is 5.450g. (i) The theoretical yield of calcium oxide in this experiment is 5.600g. Calculate the percentage yield of calcium oxide.

GCSE Edexcel Chemistry Percentage yield: Calcium carbonate decomposes on

Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide - Edexcel - GCSE Chemistry - Question 4 - 2019 - Paper 1

Question 4

Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide. CaCO₃(s) → CaO(s) + CO₂(g). (a) 8.000g of CaCO₃ was heated strongly for about 10 ... show full transcript

Worked Solution & Example Answer:Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide - Edexcel - GCSE Chemistry - Question 4 - 2019 - Paper 1

Step 1

Calculate the mass of carbon dioxide gas given off.

96%

114 rated

Answer

To calculate the mass of carbon dioxide gas produced, we first determine the mass of calcium carbonate that decomposed:

Start with the initial mass of calcium carbonate: 8.000 g.
Determine the remaining mass after heating: 6.213 g.
Calculate the mass of carbon dioxide released:

$\text{Mass of } CO_2 = \text{Initial mass} - \text{Remaining mass} = 8.000g - 6.213g = 1.787g$

Thus, the mass of carbon dioxide gas given off is 1.787 g.

Step 2

Calculate the percentage yield of calcium oxide.

99%

104 rated

Answer

To calculate the percentage yield of calcium oxide, use the formula:

$\text{Percentage Yield} = \left( \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \right) \times 100$

Here, the actual yield is the mass of calcium oxide remaining, which is 5.450 g.
The theoretical yield is given as 5.600 g.
Substitute these values into the formula:

$\text{Percentage Yield} = \left( \frac{5.450}{5.600} \right) \times 100$
Perform the calculation:

$\text{Percentage Yield} = 0.973214 \times 100 = 97.32\%$

Therefore, the percentage yield of calcium oxide is 97.32%.

Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide - Edexcel - GCSE Chemistry - Question 4 - 2019 - Paper 1

Worked Solution & Example Answer:Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide - Edexcel - GCSE Chemistry - Question 4 - 2019 - Paper 1

Calculate the mass of carbon dioxide gas given off.

Calculate the percentage yield of calcium oxide.

Join the GCSE students using SimpleStudy...