# What is the gram-formula mass of #Fe(NO_3)_3#?

To find the total mass of the nitrate, we add the mass of iron.

241.845

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Fe(NO3)3 has one iron atom (Fe), three nitrogen atoms (N), and nine oxygen atoms (O). The atomic mass of Fe is approximately 55.85 g/mol, the atomic mass of N is approximately 14.01 g/mol, and the atomic mass of O is approximately 16.00 g/mol. The gram-formula mass is calculated as follows: Fe: 1 × 55.85 g/mol = 55.85 g/mol N: 3 × 14.01 g/mol = 42.03 g/mol O: 9 × 16.00 g/mol = 144.00 g/mol Combining these masses yields: 55.85 g/mol (Fe) + 42.03 g/mol (N) + 144.00 g/mol (O) = 241.88 g/mol.

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