当前位置: > 1 A silicon chip used in an IC of microcomputer has a mass of 5.68 mg.How many silicon (Si) atoms ar...
题目
1 A silicon chip used in an IC of microcomputer has a mass of 5.68 mg.How many silicon (Si) atoms are present in the chip?2 Calcium carbonate (CaCO3),also called calcite,is the principal mineral found in limestone,marble,chalk,and pearls.(a) Calculate the molar mass of calcium carbonate.(b) A certain sample of CaCO3 contains 4.86moles.What is the mass in grams of this sample?What is the mass of the CO32- ions present?3 Determine the empirical and molecular formulas for a compound that gives the following percentages on analysis in mass percentage.The molar mass is known to be 98.96 g/mol.71.65% of Cl,24.27% of C,and 4.07% of H
1a。是说碳酸盐里钙多少模(molar)
是说现在有4.8模的碳酸盐CaCO3的样本 这个样本里有多少克碳酸盐 还有CO32-的的分子质量数
71.65% Cl,x0924.27of C,and 4.07%的H这些判断有什么化合物 已知98.96 g/mol这个单位
电脑中硅芯片共计5.68 mg 求硅芯片中硅原子的数量
大致稍微翻译了下。

提问时间:2021-03-22

答案
1 [5.68/(28.0855*1000)]*6.02*10^23=0.00121748*10^23
2 a 100g/mol(是求碳酸钙摩尔质量.翻译出错)
b 486g 291.6g
3 C2H4Cl2
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
版权所有 CopyRight © 2012-2019 超级试练试题库 All Rights Reserved.