We’re being asked to determine which of the gven reactions have a positive ΔSrxn. Recall that if:
• ΔS > 0 or ΔS = (+); entropy is increased
• ΔS < 0 or ΔS = (–); entropy is decreased
Remember that phase changes lead to a change in entropy:
Also, recall that an increase in the number of gas molecules in the reaction also leads to an increase in entropy.
Which of the following reactions have a positive ΔSrxn? Check all that apply.
2 A(g) + B(g) → C(g)
A(g) + B(g) → 3 C(g)
2 A(g) + 3 B(g) → 4 C(g)
2 A(g) + B(s) → 3 C(g)
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