Which half-reaction has the greatest tendency to occur at the anode in an electrochemical cell?

Cu2+ oxidizes to Cu will occur at the anode

Explanation:

Reduction occurs at the cathode and oxidation occurs at the anode

Al2+ reduces to Al3+ so this will occur at the cathode which will be on the left hand

Cu2+ oxidizes to Cu which oxidizes will occurs at the anode which is placed on the right hand

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%