When heated in a crucible, magnesium metal reacts with oxygen from the air to form magnesium oxide in a synthesis reaction. How do you expect the mass ofthe crucible and its contents to change after the reaction?
The mass of the crucible is constant. The mass CONTAINED by the crucible will increase..........
We can represent the oxidation so..........
And thus combustion of one equiv magnesium metal,
Often when you do the experiment, you lose some of mass, i.e. the