题干
—The meeting is about to start, yet the speaker hasn’t turned up.
— No one knows ____.
A：what the matter i
B：what is the wrong
C：what is the matter
D：how matter stood
答案(点此获取答案解析）
C
CO2(g)＋H2(g)，反应达到平衡后，测得CO2的物质的量为0.6 mol。然后再充入4 mol H2O(g)，达到新的平衡后，CO2的物质的量为( )