题目

It was (apparently) that all of the students understood. 答案：【1】apparent标准状况下，气态分子断开1mol化学键的焓变称为键焓。已知H—H，H—O，和O==O键的键焓△H分别为436KJ/mol，463KJ/mol，495KJ/mol，下列热化学方程式正确的是（ ）A． H2O(g)=H2(g)+1/2O2(g) ΔH=－485KJ/molB． H2O(g)=H2(g)+1/2O2(g) ΔH=+485KJ/molC． H2(g)+1/2O2(g)=H2O(g) ΔH=－485KJ/molD． 2H2(g)+O2(g)=2H2O(g) △H=－485KJ/mol