A student investigated the mass of magnesium oxide produced by the thermal decomposition of magnesium carbonate:
MgCO3(s)→MgO(s)+CO2(g) \text{MgCO}_3(\text{s}) \rightarrow \text{MgO}(\text{s}) + \text{CO}_2(\text{g}) MgCO3(s)→MgO(s)+CO2(g)The table below shows the student's results:
| Mass of magnesium carbonate (g) | Mass of magnesium oxide (g): Trial 1 | Mass of magnesium oxide (g): Trial 2 | Mass of magnesium oxide (g): Trial 3 | Mean mass of magnesium oxide (g) |
|---|---|---|---|---|
| 4.00 | 1.92 | 1.89 | 1.92 | 1.91 |
| 8.00 | 3.84 | 3.81 | 3.84 | 3.83 |
| 12.00 | 3.20 | 5.76 | 5.74 | ZZZ |
| 16.00 | 7.67 | 7.63 | 7.65 | 7.65 |
Identify the anomalous result in the table by stating the mass of magnesium carbonate and the trial number.
Calculate the mean mass ZZZ of magnesium oxide produced from 12.00 g of magnesium carbonate. You should exclude the anomalous result from your calculation.
Use your value of ZZZ to calculate the mass of magnesium oxide produced when 180.0 g of magnesium carbonate is heated.