The density of aluminum is 2.70 g/mL. A piece of aluminum with a mass of 244 grams, is dropped into a graduated cylinder that already contains 20.0 mL of water. What is the volume that a student would read on the
graduated cylinder after the aluminum is placed into the water?

Answer : The hydrogen gas produced at the cathode in the electrolysis of brine and the hydrogen in the hydrogen gas comes from water.

Explanation :

Brine : It is the solution of sodium chloride and water. In the process of electrolysis, new chemicals are formed by using the electric current.

In the electrolysis of brine, hydrogen gas produces at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode and the sodium hydroxide remains dissolved in the solution.

The two half-reaction equation are :

Reduction :

Oxidation :

The balanced chemical reaction will be,

Hence, the hydrogen gas produced at the cathode in the electrolysis of brine and the hydrogen in the hydrogen gas comes from water.