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# What mass of oxygen gas reacted with the magnesium ?

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- hcbiochemLv 71 month ago
1.10 g O2

You can get to this two ways.

1) You can subtract the mass of the crucible + Mg from the Mass of the crucible + MgO

2) Calculate the mass of Mg (subtract mass of empty crucible from mass of crucible + Mg)

Then calculate the mass of MgO (Subtract mass of empty crucible from mass of crucible + MgO)

Finally, subtract mass of Mg from mass of MgO

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