How Do You Calculate the Formula for Hydrated MgSO4 Using Experimental Data?

[haleybaley5]

Homework Statement

"Use your experimental data to calculate the formula for hydrated MgSO4"

Homework Equations

i used 2.25g x 1 mole/141.46 = 0.016 moles

The Attempt at a Solution

i'm not sure how to calculate the formula. how do i do that? is there a different equation involved?
please reply, i really need help.

 

[chemisttree]

assume that your product is pure MgSO4. You know the mass and FW. Calculate moles. The difference in wt betwieen starting material and product represents what?