游客
题文

已知方程式2H2(g)+O2(g)=2H2O(l) △H1=–571.6KJ·mol-1,则关于方程式
2H2O(l) =2H2(g)+O2(g) △H2=?的说法正确的是           (    )

A.方程式中化学计量数表示分子数
B.该反应△H2大于零
C.该反应的△H2=-571.6kJ·mol-1
D.该反应可表示36g水分解时的热效应
科目 化学   题型 选择题   难度 容易
登录免费查看答案和解析
相关试题

Progress______ so far very good and we are sure that the work will be finished on time.

A.was B.had been C.has been D.will be

Charles was alone at home, with_______ looking after him.

A.someone B.anyone C.not one D.no one

It is often ______ that human beings are naturally equipped to speak.

A.said B.to say C.saying D.being said

I can’t leave. She told me that I ______ stay here until she comes back.

A.can B.must C.will D.may

—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact

A.Go ahead B.Yes, my pleasure
C.Yes, I do D.Come on

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号