How many moles of electrons are required to discharge 1 mole of the following ions: Mg^2+, K^1+, Al^3+, O^2-.

Expert Answers info

ndnordic eNotes educator | Certified Educator

calendarEducator since 2009

write387 answers

starTop subjects are Science and Math

To solve this, first write an equation showing what is happening to each of the elements. Then look at the coefficients to determine the moles of electrons per mole of ion.

Mg = Mg^+2 + 2 e^-1  this means that when magnesium is oxidized it loses two moles of electrons for every mole of magnesium you started with.

K = K^+1 + 1 e^-1  or one mole of electrons produced per mole of potassium ion formed

Al = Al^+3 + 3 e^-1  or three moles of electrons produced per mole of aluminum ion formed

O + 2 e^-1 = O^-2   It takes two moles of electrons to form one mole of oxygen ion.

 

check Approved by eNotes Editorial

Unlock This Answer Now