What must you add to balance a half-reaction in an acidic solution?
A. Just add oxygen molecules to balance the equation.

B. Just add water molecules to balance the equation.

C. Just add hydrogen ions and water molecules to balance the equation.

D. Just add hydroxide ions and water molecules to balance the equation.

C

Explanation:

add water molecules to the areas deficient of oxygen and add hydrogen ions to the other side to balance it up

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a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.