A student determined that 2.5g of CaCO3 are formed by the reaction CaO+CO2=CaCO3.What quantity of heat should be released.正确答案是-4.5KJ不好意思,补充下数据。molar enthalpy of formation CaCO3 -1207.6KJCaO -634.9KJ
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/29 07:17:36
A student determined that 2.5g of CaCO3 are formed by the reaction CaO+CO2=CaCO3.What quantity of heat should be released.
正确答案是-4.5KJ
不好意思,补充下数据。molar enthalpy of formation
CaCO3 -1207.6KJ
CaO -634.9KJ
生成2.5g碳酸钙此反应需要多少热量!你去找本化学书在后面的附表查到相关物质的焓值就可以算出来了,2.5g碳酸钙就是0.025mol乘上碳酸钙的摩尔生成焓,就可以了!得到答案为负值,说明本反应需要吸热!
数据没有完全,还是要自己差数据表的?
负值貌似是放热
a determined
a determined
The first i entered the primary school,i was taught andd determined to be a college student.
A.determined B.examined
a determined personalways
determined
这句话是主系表 I am a student.这是最简单的 主 系 表 我知道I am determined to succeeddetermined to succeed这也是主系表的表语吗?am determined是过去式吗还是被动语态还是be+adj的形式I am beautiful也是主系
___ to give up smoking ,he threw away his ___cigarettes A.Determined;remained B.Determined;remaininA.Determined;remained B.Determined;remainingC.Determining;remained D.Determining;remaining
she is a very determined person.字典里说determined不能放在名词前.
可不可以直接说 She is determined.还是只能说 She is a determined person.
( )to change,he entered a diet program and dropped 70 pounds.determined,having determined ,havin( )to change,he entered a diet program and dropped 70 pounds.A determined,B having determined ,C having been determined 选什么?为什么?
determined to 可替换为having determined吗比如这个题吧 He left the place,____never to return .A.determined B.to determine C.being determined D.having determined
student B orders food from student A.
Are you a student?
many a student是什么意思?
She is a student
many a student是什么意思?
______I a good student?