The sign of ΔSsys for Atmospheric CO₂ dissolves in the ocean is negative.
The Entropy (S) is the measure of the randomness of a system. Entropy change is directly proportional to heat change.
When heat is added into a system, its entropy increases and ΔSsys becomes positive. This happens because addition of heat causes an increase in the motion of molecules this increasing the randomness of the system.
When heat in the system decrease, randomness also decrease and ΔSsys becomes positive. When Atmospheric CO2 dissolves in the ocean, the randomness decreases and the entropy also decreases. The sign of ΔSsys is negative.
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