according to the kinetic theory the pressure exerted by a sample of gas at constant volume doubles when the absolute temperature is doubled because

Due to expansion.

Explanation:

The pressure exerted by a sample of gas at constant volume doubles when the absolute temperature is doubled because with the increase of temperature, the molecules of gas start expansion which increases their volume and as a result pressure of a gas increases. Increasing temperature of a gas sample increases the kinetic energy of the particles, and as a result the gas expand.

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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