Calcium carbonate decomposes on heating producing potassium nitrate and oxygen. Write a balanced equation for this reaction. Heating 100g of pure potasium nitrae what mass of potassium nitrate would be produced?
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To write a balanced equation for the decomposition of calcium carbonate, we first need to understand the chemical formulas of each compound involved in the reaction.
The chemical formula for calcium carbonate is CaCO3.
The chemical formula for potassium nitrate is KNO3.
The products of the decomposition reaction are potassium nitrate (KNO3) and oxygen gas (O2).
The balanced equation for the reaction can be written as:
CaCO3 -> KNO3 + CO2
Balancing the equation, we need one molecule of CaCO3 to react with one molecule of KNO3, producing one molecule of KNO3 and one molecule of CO2.
Now, let's move on to calculating the mass of potassium nitrate produced.
First, we need to determine the molar mass of KNO3. The molar mass of potassium (K) is 39.10 g/mol, nitrogen (N) is 14.01 g/mol, and oxygen (O) is 16.00 g/mol. Adding these values together, we get:
Molar mass of KNO3 = (39.10 g/mol) + (14.01 g/mol) + (3 * 16.00 g/mol) = 101.10 g/mol
This means that one mole of potassium nitrate (KNO3) weighs 101.10 grams.
To find the mass of potassium nitrate produced when heating 100 grams of pure potassium nitrate, we need to convert the mass given into moles. Since we know the molar mass of KNO3 is 101.10 g/mol, we can use the following formula:
moles = mass / molar mass
moles of KNO3 = 100 g / 101.10 g/mol
Calculating this, we find that the number of moles of KNO3 is approximately 0.99 moles.
Since the balanced equation shows that one mole of CaCO3 produces one mole of KNO3, the number of moles of KNO3 produced will be the same as the number of moles of CaCO3 decomposed.
Therefore, 0.99 moles of KNO3 will be produced when heating 100 grams of pure potassium nitrate.
To find the mass of KNO3 produced, we can use the molar mass once again:
mass = moles * molar mass
mass of KNO3 = 0.99 moles * 101.10 g/mol
Calculating this, we find that the mass of potassium nitrate produced is approximately 100 grams.
Therefore, when heating 100 grams of pure potassium nitrate, approximately 100 grams of potassium nitrate will be produced.