Forests exchange large amounts of CO2 and other gases with the atmosphere and store carbon, in various forms, in trees and soils. ... Much of the CO2 in the air above a forest is taken in by trees through the process of photosynthesis,where it becomes one of the building blocks fortree growth or energy for life. (i hope this can help you ):)
The answer is "stays the same".
Whether what kind of process the substance undergoes, the mass will stay the same. When a substance undergoes a phase change, the weight of the substance would either increases or decreases but the mass will definitely stay the same.
