Which relationship or statement best describes ΔS° for the following reaction?
C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l)
(A) ΔS° ≈ 0 (B) ΔS° < 0 (C) ΔS° > 0 (D) ΔS° =ΔH° /T
(E) More information is needed to make a reasonable prediction.
Answer is (B)
and if the reaction change to
BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq).
Why the answer is also (B)?
- 匿名使用者9 年前最佳解答
The answer in both cases in B because you are increaseing in disorder (ΔS). The reason I know this is that n the left side of the top equation there is 4 molecules and on the right there are 5 molecules, ie more disorder.
For the bottom equation there are 2 molecules on the left, going to three molecules on the right.