What is the gram-formula mass of [tex]$\text{Fe(NO}_3)_3$[/tex]?
1. 146 g/mol
2. 194 g/mol
3. 214 g/mol
4. 242 g/mol
Answer (3)
The gram-formula mass of Fe(NO₃)₃ is 242 g/mol. Therefore, option D is correct.
Gram-formula mass is also known as the molar mass . It refers to the mass of one mole of a substance. It is expressed in units of grams per mole (g/mol) and is commonly used in chemistry to relate the amount of a substance to its mass.
The **atomic **mass of Iron= 56 amu.
The atomic mass of Nitrogen = 14 amu.
The atomic mass of Oxygen = 16 amu.
Gram-formula **mass **of Fe(NO₃)₃ = (Atomic mass of Fe) + 3 × {(Atomic mass of N × 1) + (Atomic mass of O × 3)}
= 56 + 3 × (14 × 1 + 16 ×3)
= 56 + 3 × (14 + 48)
= 56 + 3 × 62
= 56 + 186
= 242 g/mol
Therefore, the gram-formula **mass **of Fe(NO₃)₃ is 242 g/mol.
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The gram-formula mass of Fe(NO₃)₃, is 242 g/mol, calculated by considering the molar masses of iron, nitrogen, and oxygen and adding them together.
The gram-formula mass of Fe(NO₃)₃, is 242 g/mol. To calculate this, we need to consider the atomic masses of each element present in the compound: Fe = 55.85 g/mol, N = 14.01 g/mol, and O = 16.00 g/mol. By adding the molar masses for each element in Fe(NO₃)₃, we get 55.85 + (3 x 14.01) + (9 x 16.00) = 242 g/mol.
The gram-formula mass of Fe(NO 3 ) 3 is calculated to be approximately 242 g/mol, matching option 4. This involves adding the contributions from iron, nitrogen, and oxygen in the formula. Thus, the correct answer is option 4.
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