反应H2(g)+Br2(g)→2HBr(g)的△r
与反应H2(g)+Br2(l)→2HBr(g)的△r
相同。
与反应H2(g)+Br2(l)→2HBr(g)的△r相同。
举一反三
- 为使锅垢中难溶于酸的CaSO4转化为易溶于酸的CaCO3，常用Na2CO3处理，反应式为CaSO4+CO32-<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/88320eab77594b6abf0039ab0efe3c57.png" />CaCO3+SO42-，此反应的标准平衡常数为（）。 A: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)·K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3) B: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)/K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4) C: [K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)·K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)]1/2 D: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)/K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)
- 在<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202104/eb254aec548342c5bb15b15aae65aaf6.png" />f和声小调中，构成属和弦的三个音是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202104/eb254aec548342c5bb15b15aae65aaf6.png" />C，E，G B: C，E，G C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202104/eb254aec548342c5bb15b15aae65aaf6.png" />C，E，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202104/eb254aec548342c5bb15b15aae65aaf6.png" />G D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202104/eb254aec548342c5bb15b15aae65aaf6.png" />C，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202104/eb254aec548342c5bb15b15aae65aaf6.png" />E，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202104/eb254aec548342c5bb15b15aae65aaf6.png" />G
- 下列两个反应的热效应相比,第 ② 个放热较多: [br][/br]① H2 ( g ) + Br2 ( g ) → 2 HBr ( g )[br][/br]② H2 ( g ) + Br2 ( l ) → 2 HBr ( g )
- 设随机变量X~N(4,2)，则其特征函数为(). A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/357ad388efa144a1a2b824e2b1ded239.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/d52e72841a81484981168cbb693bad24.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/00e1e0c2bba04889b58eb483c88821fb.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/1851c30670244a5c821128d6c44a3ecc.png" >
- 10人中至少有2人同生日的概率是多少？（1年按365天计算）() A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/f3b577db2dd0429b9eab51dff5644b23.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/6f30552128e14bfb89b26b30ac2b72db.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/fa8f9ba9bd2d4a40b7d007fd9e9988fd.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/05a12b5d4da04e2c9ea779b313981c83.png" >