1. Identify the chemical formula:
* Iron sulfate is FeSO₄
2. Determine the atomic masses of each element:
* Iron (Fe): 55.845 u
* Sulfur (S): 32.065 u
* Oxygen (O): 15.999 u
3. Multiply the atomic mass of each element by its subscript in the formula:
* Fe: 55.845 u * 1 = 55.845 u
* S: 32.065 u * 1 = 32.065 u
* O: 15.999 u * 4 = 63.996 u
4. Add the values from step 3 to get the RFM:
* 55.845 u + 32.065 u + 63.996 u = 151.906 u
Therefore, the relative formula mass of iron sulfate (FeSO₄) is 151.906 u.
