Answer:
The answers that represent a decrease in entropy are:
-CO2 gas is dissolved in water to make a carbonated beverage
-NO2(g) → N2O4(g)
Step-by-step explanation:
Since in carbonated drinks, carbon dioxide is in its liquid form, since a pressure is applied to said gas, in this way, when carbon dioxide dissolves in a liquid, its entropy decreases, thus producing a negative change in entropy (the entropy of a gas is higher than the entropy of a liquid).
The number of gaseous reagents is equal to 1-2 = -1. Since it is negative, therefore, entropy is also negative.