If the potato cells decreased in mass what was lost from the cells:

water. most likely if the cell is dehydrated less water will be in the cell therefore decreasing in size etc.

Explanation:

i am going to guess that it is co2.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.