問題詳情
29. Consider the following changes: H2O(s) → H2O(l) △ H1 H2O(l) → H2O(g) △ H2 H2O(g) → H2O(s) △ H3 Using Hess’ Law, the sum all of △ H1 + △ H2 + △ H3 is
(A) > 0
(B) = 0
(C) < 0
(D) sometimes > 0 and sometimes < 0
參考答案
答案：B
難度：適中0.631579
統計：A(4),B(12),C(3),D(0),E(0)