1. Calculate the molar mass of Ca₃N₂:
* Ca: 40.08 g/mol (atomic mass of Ca) * 3 = 120.24 g/mol
* N: 14.01 g/mol (atomic mass of N) * 2 = 28.02 g/mol
* Total molar mass of Ca₃N₂ = 120.24 g/mol + 28.02 g/mol = 148.26 g/mol
2. Calculate the mass percentage of each element:
* Calcium (Ca): (120.24 g/mol / 148.26 g/mol) * 100% = 81.12%
* Nitrogen (N): (28.02 g/mol / 148.26 g/mol) * 100% = 18.88%
Therefore, the proportion by mass of Ca in Ca₃N₂ is 81.12%, and the proportion by mass of N is 18.88%.
