题目

1.A certain copper ore contains 2.80% of Cu2S by mass,and the remainder of the ore contains no copper.In a particular year,a single open-air smelt furnace heated 36000 tons of this ore.Compute the maximum mass of copper metal that could have been obtained by this process.
这道题我都用计算器算,然后查表看相对原子质量.但是数据总是不对,我怀疑老师出错题了.老师的提示：Try doing this in steps.You need to account for the percentage of the ore that is Cu2S and also for the fraction of Cu2S that is actually copper.
2.A sample of an unknown biochemical compound is found to have a percent composition of 36.10% carbon,5.30% hydrogen,10.53% nitrogen and the balance oxygen.What is the empirical formula for this compound
这道题我的思路不是特别清楚.老师的提示是：In order to avoid errors due to rounding,you should use molar masses with as many significant figures as possible in this type of problem.

提问时间：2021-01-21

答案

第一题不说了,第二题个人觉得说是生物化学的化学物,也就差不多有机物吧,含氧氢碳氮,那么在知道题目意思的基础上我们是否可以将其总数设1,进而各种元素含量就可以出来,分别除以各种相对原子质量,那么就可以得到各种元...