已知氢气的燃烧热为286 kJ/mol；且H2O(g) = H2O(l) ΔH = -44 kJ/mol。下列热化学方程式正确的是

题干

已知氢气的燃烧热为286 kJ/mol；且H₂O(g) = H₂O(l) ΔH = -44 kJ/mol。下列热化学方程式正确的是（）

A：2H₂(g) + O₂(g) = 2H₂O(g) ΔH = -286 kJ/mol

B：2H₂(g) + O₂(g) = 2H₂O(g) ΔH = -572 kJ/mol

C：H₂(g) + $\frac{1}{2}$ O₂(g) = H₂O(g) ΔH = -330 kJ/mol

D：H₂O(g) = H₂(g) + $\frac{1}{2}$ O₂(g) ΔH=+242kJ/mol

上一题下一题 0.0难度选择题更新时间:2013-06-19 02:17:56

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D

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Li Hua is thirteen years old. He’s a   【小题1】 . He’s the only child in the family. He doesn’t   【小题2】 his things.
One morning when the students of Class Two are   【小题3】 an English class, Li Hua goes to the door and says, “   【小题4】  I come in, Mr. Wang ?”
“Oh, you are 【小题5】 again,” says the teacher, “Can you tell me why you are late ?”
“My grandma 【小题6】 some apples, bananas and bread in my schoolbag this morning. I take the schoolbag with me after I have【小题7】. But   【小题8】 my way to school, I find there are no 【小题9】 in my schoolbag. I have to 【小题10】 and take them.”

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