5.3化学反应中的有关计算—2021-2022学年化学鲁教版九年级上册随堂小测
※题型：单选题※知识点：单选题※试题难度：中等<br>在反应2A+5B=2C+4D中,C、D的相对分子质量分别为18和44.若2.6gA与B完全反应后,生成8.8gD,则在此反应中,B与D得质量比为( )<br>A.4:9 B.8:11 C.10:11 D.31:44<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2019/bd2e9256971c40baab5b13f78f0f81ee/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2019/3b8d714c0e9c4a498126dcd4290ecf9f/B62BF70414F7889A08AE5C8ABB5B9C1D.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>相同质量的碳完全燃烧生成<img src="https://picture2.zhihuicn.com/testImage/2/2020/9/28/1E2B315962D7AFB9356B2F2B159D094F.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2020/9/28/7002435560602C62060BA723DC55D86C.png"><br>消耗的氧气的质量比是( )<br>A.2∶1 B.1∶2 C.14∶11 D.11∶14<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/72feb4f1882b4f289c2a51ca5eef5cfa/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/07ddc492509f41fd8d9800aa171ee5c8/F2F40A16317ED87C6AF49D2E712598E5.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>氢气在氧气中燃烧生成水,在该反应中,氢气、氧气、水的质量比为( )<br>A.1:16:18 B.1:16:9 C.2:1:2 D.1:8:9<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/4fb9ce1ebffa4b1aa694dd32dcf28d84/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/531ca5f4af0249cd841ac33f38ed3e4a/52ADB58894C8F58683D029535CB9AB3D.png"><br><br>※题型：计算题※知识点：计算题※试题难度：中等<br>为了测量某石灰石矿中碳酸钙的含量,进行了如下实验:称取<br>10g<br>石灰石样品,反复灼烧至质量不再改变,称量剩余固体质量为<br>6.7g<br>(反应的化学方程式为<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/10/19/25E9053F886B39F3716E4FC3A26011E7.png"><br>假设杂质不参<br>与反应),请计算。<br>1.反应生成的<img src="https://picture2.zhihuicn.com/testImage/2/2020/10/19/7002435560602C62060BA723DC55D86C.png"><br>的质量为g。<br>2.该石灰石样品中碳酸钙的质量分数(写出计算过程)。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/479720b6c1334f4baadae896fd7f27d3/6B4947B2F8CD2A39CCF09D43F8BED8CD.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/bbc3e81241774482a798734e183f5845/3BF28B4BAA7A849CC8E3CA33B7169D9E.png"><br><br>
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