求人帮忙,急)在一个密闭容器中,盛有N2和H2,它们的起始浓度分别是1.8MOL/·l-1和5.4mol

作者&投稿:仁莺 (若有异议请与网页底部的电邮联系)
怎么出来化学了
这题好算
写出方程式N2+3H2=可逆=2NH3
带入算就行了
N2 + 3H2=可逆= 2NH3
1 2
1.8-0.8 x
1/2=(1.8-0.8)/x ,得到10min后氨的浓度为2mol/L
这就算出平均反应速率2/10=0.2mol·L-1·min-1
于是答案选C

我觉得是0.2
N2的浓度1.8-0.8=1
每个NH3含一个N,一个N2含2个N原子,所以NH3的浓度是2,总共10分钟
2/10=0.2

方程 N2 + 3H2 = 2NH3
起始 1.8 5.4 0
结束 0.8
反应 1 3 2(反应浓度是与系数成比例的)

所以N2的速率是V=1/10=0.1mol/(l·min)
因为速率和系数成正比
所以NH3的速率是0.2mol·L-1·min-1
选C

一般做这类题目都是用这种方法,列上面的化学方程式能理清思路

望采纳。谢谢

写出方程式N2+3H2=可逆=2NH3
带入算就行了
N2 + 3H2=可逆= 2NH3
1 2
1.8-0.8 x
1/2=(1.8-0.8)/x ,得到10min后氨的浓度为2mol/L
这就算出平均反应速率2/10=0.2mol·L-1·min-1
于是答案选C

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C

在一个密闭容器中,盛有N2和H2,它们的起始浓度分别是1.8mol?L-1和5.4mol?L-1,在一定的条件下它们反应生~

v(N2)=1.8mol/L?0.8mol/L10min=0.1mol?L-1?min-1,同一反应,不同物质反应速率速率之比等于计量数之比,所以v(NH3)=2 v(N2)=2×0.1mol?L-1?min-1=0.2 mol?L-1?min-1 故选:C

N2+3H2==2NH3
∵N2: 1.8-0.8=1mol/L
1/10min=0.1mol/(L/min)
∴NH3:0.1x2=0.2mol/(L/min)

虽不是高手,但要说答案错了

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