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2026年全国高考黑吉辽蒙化学试卷14题解析

  • 2026-06-21 01:16:57
2026年全国高考黑吉辽蒙化学试卷14题解析

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    同学们,这道化学平衡图像题是高考高频易错题!很多同学分不清曲线对应物质、看错速率比例,算转化率与平衡常数时列式总出错,还容易误判焓变熵变。今天咱们拆解图像、巧用计量数,一次性扫清图像平衡计算的各类陷阱。

2026年高考黑吉辽蒙化学试卷14题解析

2026年6月17日

第一部分原题呈现】

14.恒容密闭容器中,等物质的量的C3H8SO2发生的总反应如下:3C3H8(g)+SO2(g)3C3H6(g)+H2S(g)+2H2O(g),达到平衡时,相关物质平衡组成随温度变化关系如图。下列说法正确的是

A.该反应的H<0,∆S>0

B.LC3H8的消耗速率大于a物质的生成速率

C.M点该反应的Kx=0.135(用物质的量分数代替浓度计算)

D.NC3H8的平衡转化率为75%

第二部分整体概述】

    给出可逆气相总反应:3C3H8(g)+SO2(g)3C3H6(g)+H2S(g)+

2H2O(g);初始投料C3H8SO2物质的量相等;恒容密闭体系;图像为平衡态各物质物质的量分数随温度变化曲线,一条下降曲线标注C3H8(g),三条上升曲线a、b、c;设问包含焓变熵变判断、反应速率定量比较、物质的量分数平衡常数Kx计算、反应物平衡转化率计算。

    先做基础计量分析:反应前后气体计量数:反应物3+1=4mol气体;生成物3+1+2=6mol气体,气体分子数增多,S>0;温度升高,C3H8物质的量分数持续降低,说明升温平衡正向移动,正反应吸热H>0。产物三种:3C3H6H2S、2H2O,平衡时物质的量之比恒为3:1:2,对应三条上升曲线a(量分数最大:C3H6)b(H2O)c(H2S)

    本题是高三化学化学平衡选择综合题型,以丙烷与二氧化硫的气相可逆反应为陌生反应情境,融合图像信息曲线分析、热力学判据(∆H、S)、反应速率定量关系、新型平衡常数Kx(物质的量分数代替浓度)、平衡转化率五大核心考点。命题采用“文字反应方程式+平衡组分温度变化图像”复合信息载体,不直接标注产物曲线种类,需要学生依托化学计量数自主匹配曲线归属;设问兼具定性判断(焓熵、速率大小)与定量精确计算(Kx、转化率),设置多层思维障碍:一是曲线归属的计量推导,二是速率之比等于计量数之比的定量比较,三是Kx以物质的量分数为参数的全新计算范式,四是转化率基于物质的量分数交点的代数建模求解。命题打破单一平衡计算模式,串联热力学、动力学、平衡定量运算,侧重学生图像信息提取、计量逻辑推导、多变量代数运算能力,是典型“图像分析+热力学+平衡定量”综合考查范式,区分学生对平衡体系多维度综合处理能力。

第三部分  选项详解】

先前置统一基础推导:反应:3C3H8(g)+SO2(g)3C3H6(g)+H2S(g)+

2H2O(g)。设初始n0(C3H8)=n0(SO2)=1mol;平衡时C3H8转化3xmol,则SO2转化xmol,生成C3H6=3xmol,H2S=xmol,H2O=2x

mol。平衡各组分物质的量:n(C3H8)=(1-3x)moln(SO2)=(1-x)moln(C3H6)=3xmoln(H2S)=xmoln(H2O)=2xmol平衡总物质的量:n=(1-3x)+(1-x)+3x+x+2x=(2+2x)mol。产物平衡物质的量比值:n(C3H6):n(H2O):n(H2S)=3:2:1,故曲线a代表C3H6,b代表H2O,c代表H2S。

A选项:该反应的∆H<0,∆S>0

    熵变计量判断+温度平衡移动法熵变:反应物气体总计量数3+1=4;生成物3+1+2=6,气体分子数目增大,混乱度升高,S>0。焓变:升温时,C3H8平衡物质的量分数持续减小,说明升高温度,平衡向消耗C3H8的正向移动;根据勒夏特列原理,正反应为吸热,H>0,所以A选项错误。

B选项:LC3H8的消耗速率大于a物质的生成速率

    平衡态速率计量关系法L点在平衡曲线上,体系处于化学平衡状态;平衡时,正、逆反应速率满足计量数比例:ν正(C3H8):ν正(C3H6)=3:3=1:1C3H8消耗速率=ν正(C3H8);C3H6生成速率=ν正(C3H6),二者相等,所以B选项错误。

C选项:M点该反应的Kx=0.135(用物质的量分数代替浓度计算)

    M点为曲线b(H2O)C3H8交点,故M点x(H2O)=x(C3H8)1-3x=2x,解得x=0.2mol,则此时n(C3H8)=1-3x=0.4mol,n(SO2)=1-x=0.8mol,n(C3H6)=3x=0.6mol,n(H2S)=x=0.2mol,n(H2O)=2x=

0.4mol,各组分总物质的量为2.4mol,故物质的量分数平衡常数Kx=

≈0.0234,所以C选项错误

D选项:NC3H8的平衡转化率为75%

转化率定义计算N点:C3H8曲线与c(H2S)曲线相交,二者物质的量分数相等,即二者物质的量相等,1-3x=x,解得x=0.25,说明C3H8转化了0.75mol,因此C3H8的平衡转化率为:0.75mol/1mol×

100%=75%所以D选项正确。

综上所述,D选项正确,为本题正确答案。

第四部分必备知识】

1.化学反应热力学:气体分子数变化与熵变∆S判断;温度对化学平衡移动影响,勒夏特列原理。

2.化学平衡动力学:平衡状态下正反应速率之比等于化学计量数之比。

3.化学平衡定量计算:三段式平衡建模、平衡转化率定义。

4.新型平衡常数:Kx(以物质的量分数替代浓度)的定义与计算逻辑。

5.气相平衡图像分析:多条平衡组分曲线归属依托化学计量数推导,交点的物理含义(物质的量分数相等)。

第五部分 复习启示

1.做多曲线平衡图像题,优先利用反应计量关系预判曲线增减趋势、组分相对量大小;圈出交点、拐点关键信息。

2.区分平衡“速率相等”严格条件:平衡时正逆速率满足计量比例,同种方向速率直接按计量数对比。

3.平衡定量计算前先核查图像是否提供有效定量数值,警惕凭空计算平衡常数类陷阱。

4.建立标准化三段式解题流程,遇到交点等量条件主动列出等式求解未知转化量。

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  1. CONNECT:[ UseTime:0.000554s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000626s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000309s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000509s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000521s ]
  8. SELECT * FROM `article` WHERE `id` = 504406 LIMIT 1 [ RunTime:0.000493s ]
  9. UPDATE `article` SET `lasttime` = 1781978183 WHERE `id` = 504406 [ RunTime:0.012565s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000272s ]
  11. SELECT * FROM `article` WHERE `id` < 504406 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000452s ]
  12. SELECT * FROM `article` WHERE `id` > 504406 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000353s ]
  13. SELECT * FROM `article` WHERE `id` < 504406 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000617s ]
  14. SELECT * FROM `article` WHERE `id` < 504406 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000707s ]
  15. SELECT * FROM `article` WHERE `id` < 504406 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000926s ]
0.095328s