A student investigated the mass of calcium oxide produced by thermal decomposition of calcium carbonate:
CaCO3(s)→CaO(s)+CO2(g) \text{CaCO}_3(\text{s}) \rightarrow \text{CaO}(\text{s}) + \text{CO}_2(\text{g}) CaCO3(s)→CaO(s)+CO2(g)The table below shows the student's results:
| Mass of calcium carbonate (g) | Mass of calcium oxide (g): Trial 1 | Mass of calcium oxide (g): Trial 2 | Mass of calcium oxide (g): Trial 3 | Mean mass of calcium oxide (g) |
|---|---|---|---|---|
| 5.00 | 2.85 | 2.78 | 2.80 | 2.81 |
| 10.00 | 5.62 | 5.58 | 5.60 | 5.60 |
| 15.00 | 8.38 | 8.42 | 5.10 | YYY |
| 20.00 | 11.24 | 11.18 | 11.21 | 11.21 |
Identify the anomalous result in the table by stating the mass of calcium carbonate and the trial number.
Calculate the mean mass YYY of calcium oxide produced from 15.00 g of calcium carbonate. You should exclude the anomalous result from your calculation.
Use your value of YYY to calculate the mass of calcium oxide produced when 135.0 g of calcium carbonate is heated.