Balance this half-reaction: re → reo2 (acidic solution)

Balance atoms (for everything except oxygen and hydrogen):

Re → ReO2  (atoms are balanced)

Balance oxygen:

2H2O + Re → ReO2

Balance hydrogen:

2H2O + Re → ReO2 + 4H+

Balance charge:

2H2O + Re → ReO2 + 4H+ + 4e-

Explanation:

Edmentum

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation: