chem.............................?

Question

How many electrons are transferred in the redox reaction shown below?

3Cd + 8H+ + 2NO3- → 3Cd2+ + 2NO + 4H2O

Answer 1

The only two things whose oxidation states are changing are Cd and N. Since Cd is going from an oxitaion state of 0 to +2, each Cd atom loses 2 electrons. Since the balanced equation has 3 Cd, there is a total of 6 electrons being transferred.

You could also look at the oxidation state change of N and come to the same conclusion.