The most likely reason why the potato chunks gained mass is that water entered the potato cells.
How does water enter potato cells?
The process of Osmosis allows water to pass through the semi-permeable membrane of potato cells.
This happens when the potato cells have less water than the material around them which then leads to water entering the cells to balance the water concentration.
The potato cells will expand and have more mass as a result.
Find out more on osmosis at https://brainly.com/question/2625460.
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