AP Chemistry
1.4 Composition of Mixtures
1.1 Moles and Molar Mass
A student analyzes a solid mixture containing calcium carbonate, \(\text{CaCO}_3\), and an inert, thermally stable inorganic filler. The student places a sample of the mixture into a crucible and heats it strongly to decompose the calcium carbonate according to the following reaction:
\[ \text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g) \]
The filler does not react or lose mass upon heating. The student collects the gravimetric data shown in the table below.
Based on the data, what is the percent by mass of the inert filler in the original mixture?
\[ \text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g) \]
The filler does not react or lose mass upon heating. The student collects the gravimetric data shown in the table below.
| Measurement | Mass (\(\text{g}\)) |
|---|---|
| Mass of empty crucible and cover | \(24.35\) |
| Mass of crucible, cover, and sample before heating | \(29.35\) |
| Mass of crucible, cover, and contents after first heating | \(27.72\) |
| Mass of crucible, cover, and contents after second heating | \(27.59\) |
| Mass of crucible, cover, and contents after third heating | \(27.59\) |
Based on the data, what is the percent by mass of the inert filler in the original mixture?
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