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Checking Active Mass With Two Measurements 4 questions
Checking Active Mass With Two Measurements
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A classroom model tests a 4.00 g powder sample containing calcium carbonate and an inert filler. The filler uses no acid and produces no gas. All calcium carbonate reacts, using two moles of H+ for each mole of CaCO3 and producing one mole of CO2. The model uses 100.0 g/mol for CaCO3.
| Record | Measured amount |
|---|---|
| H+ used by the powder | 0.060 mol |
| CO2 collected | 0.020 mol |
Question 1
How many moles of calcium carbonate reacted according to the acid measurement?
- 0.020 mol
- 0.030 mol
- 0.040 mol
- 0.060 mol
Question 2
Calculate the mass of inert filler in the original sample. Use the acid record and the molar mass.
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Question 3
A student says the CO₂ collected shows that only 0.020 mol of calcium carbonate reacted. Evaluate the claim using the independent acid record.
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A repeat uses an identical powder sample. The acid record is unchanged, and the collection system now captures all the carbon dioxide produced.
Question 4
Predict the new carbon dioxide reading and explain whether improved collection changes the amount of filler inferred from the acid record.
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