Questions: 7. What is the molar mass of ferrous nitrite?

Solution Steps

Ferrous nitrite is composed of iron (Fe) in the +2 oxidation state and the nitrite ion (NO\(_2^-\)). The chemical formula for ferrous nitrite is Fe(NO\(_2\))\(_2\).

• Iron (Fe): 55.845 g/mol
• Nitrogen (N): 14.007 g/mol
• Oxygen (O): 15.999 g/mol

• Iron: \(1 \times 55.845 \, \text{g/mol} = 55.845 \, \text{g/mol}\)
• Nitrogen: \(2 \times 14.007 \, \text{g/mol} = 28.014 \, \text{g/mol}\)
• Oxygen: \(4 \times 15.999 \, \text{g/mol} = 63.996 \, \text{g/mol}\)

Add the molar masses of all the components to find the total molar mass of ferrous nitrite: \[ 55.845 \, \text{g/mol} + 28.014 \, \text{g/mol} + 63.996 \, \text{g/mol} = 147.855 \, \text{g/mol} \]

Final Answer