If I have 20g of Sodium, how many moles of Sodium Oxide (Na2O) can be made?

Can someone me with questions 15 to 17 plz.

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

Iwould appreciate if someone could me.