Weight of empty crucible and cover = 23.104 g
Weight of crucible, cover, MgO and Mg3N2 = 24.199 g
Weight of crucible, cover, MgOand addition of H2O and heat = 24.290

Calculate the number of moles of Mg3N2.

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  1. The change in mass was 0.0910g

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  2. If you mean the mass Mg3N2 = 0.0910 then mols = grams/molar mass

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