已知：(1)Zn(s)＋1/2O2(g) = ZnO(s)△H =－348.3 kJ/mol(2) 2Ag(s)＋1/2O2(g) = Ag2O(s) △H =－31.0 kJ/mol则Zn(s)＋A_刷题宝

题干

已知：

(1)Zn(s)＋1/2O₂(g) = ZnO(s) △H =－348.3 kJ/mol

(2) 2Ag(s)＋1/2O₂(g) = Ag₂O(s) △H =－31.0 kJ/mol

则Zn(s)＋Ag₂O(s) = ZnO(s)＋2Ag(s)的△H等于（）

A：－317.3 kJ/mol

B：－379.3 kJ/mol

C：－332.8 kJ/mol

D：317.3 kJ/mol

上一题下一题 0.0难度选择题更新时间:2013-05-07 08:29:56

答案(点此获取答案解析）

A

同类题1

阅读下面短文，从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。

Mabel was a naughty boy and he was not good at his study. “Could do better” were usually the 1 at the bottom of his report card. His parents 2 Mabel's marks a lot. How they wished Mabel made a little progress. But whenever they got his report card, they were quite disappointed, 3 their heads.

At the end of the term, the report card would be sent home. Mabel wished to find a safe place away from the 4 faces of his parents. One morning, when Mabel was still in bed, his mother rushed into his room, holding the report card in hand. “Well done, son. You are number one in the class. You are our 5.” She gave Mabel a big kiss. Mabel could not believe it, 6 he looked at the report card carefully.

Very soon, Mabel found out it was Manuel's report card, not his. The teacher had made a 7. His mother had left, busying calling all the family about the 8 news. Mabel wondered what the right thing to do was. He thought for a while, whether to please his parents 9 to be an honest boy. Finally, he decided to tell his parents the 10.

同类题2

如果角θ的终边经过点 $(- \frac{\sqrt{3}}{2}, \frac{1}{2})$ ，那么tanθ的值是（）

同类题3

和万位相邻的两个数位是千位和百位。

同类题4

下列操作不合适的是
①银镜反应采用水浴加热。 ②用通过酸性KMnO₄溶液的方法除去甲烷气体中含有
的CH₂=CH₂杂质。 ③葡萄糖还原新制Cu（OH）₂的实验，可直接加热；且制取
Cu（OH）₂时，应保持NaOH过量。 ④制银氨溶液时，将AgNO₃溶液滴入氨水中。

同类题5

交通法规定，乘坐汽车时，乘客必须系好安全带．这是主了防止汽车突然减速，乘客由于____，身体向前倾倒而造成伤害．假如正在行驶的汽车所受的力全部消失，汽车将会处于____状态．（选填“静止”、“匀速直线运动”、“加速运动”或“减速运动”）

小学学科试题库

初中学科试题库

高中学科试题库