How many equivalents are in 0.70 mole of Fe 3+?

I believe the answer you are looking for is 0.40Eq

In your example, you're dealing with a potassium cation,
K
+
. This ion carries a
1
+
charge, so right from the start you know that you're looking for the number of
1
−
ions, i.e. monovalent ions of opposite charge, needed to neutralize this
1
+
charge.
Since a charge of
1
+
can be neutralized by a charge of
1
−
, it follows that every mole of potassium cations will produce
1
mole of equivalents in solution.