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.

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)