how many milligrams of Na(deDTC)3H2O is needed if 70 mg of FeCl36H2O is used?

my work: 70mg(1mol/170.5gFeCl36H20)(225.3gNa(deDTC)3H20/1mo)

but the answer was incorrect...

is the mole ratio 1:1???

You need to be more specific about what you are doing.

#1. What is Na(deDTC)3H2O?
#2. How is FeCl3.6H2O involved?
#3. Is there anything else being added?