Let's proceed step by step.
### Part (i): Calculate the mass of magnesium oxide formed
To find the mass of magnesium oxide formed, we need to consider the given data:
- Mass of crucible + lid = [tex]\( 32.00 \, \text{g} \)[/tex]
- Mass of crucible + lid + magnesium oxide = [tex]\( 32.40 \, \text{g} \)[/tex]
The mass of magnesium oxide formed can be found by subtracting the mass of the crucible and lid from the mass of the crucible, lid, and magnesium oxide:
[tex]\[
\text{Mass of magnesium oxide} = \text{Mass of crucible + lid + magnesium oxide} - \text{Mass of crucible + lid}
\][/tex]
By substituting the values:
[tex]\[
\text{Mass of magnesium oxide} = 32.40 \, \text{g} - 32.00 \, \text{g}
\][/tex]
[tex]\[
\text{Mass of magnesium oxide} = 0.40 \, \text{g}
\][/tex]
### Part (ii): Calculate the mass of oxygen that combined or joined with magnesium in the experiment
We know the given data:
- Mass of magnesium = [tex]\( 0.24 \, \text{g} \)[/tex]
- Previously calculated mass of magnesium oxide = [tex]\( 0.40 \, \text{g} \)[/tex]
The mass of oxygen that combined with magnesium can be found by subtracting the mass of magnesium from the mass of magnesium oxide:
[tex]\[
\text{Mass of oxygen} = \text{Mass of magnesium oxide} - \text{Mass of magnesium}
\][/tex]
By substituting the values:
[tex]\[
\text{Mass of oxygen} = 0.40 \, \text{g} - 0.24 \, \text{g}
\][/tex]
[tex]\[
\text{Mass of oxygen} = 0.16 \, \text{g}
\][/tex]
### Summary:
i) The mass of magnesium oxide formed is [tex]\( 0.40 \, \text{g} \)[/tex].
ii) The mass of oxygen that combined with magnesium in the experiment is [tex]\( 0.16 \, \text{g} \)[/tex].
