题目

A cube of gold that is 1.00 cm on a side has a mass of 19.3 g.A single gold atom has
A cube of gold that is 1.00 cm on a side has a mass of 19.3 g.A single gold atom has a mass of 197.0 amu.
(a) How many gold atoms are in the cube?
(b) From the information given,estimate the diameter in angstroms of a single gold atom.

提问时间：2021-04-07

答案

（a）先求物质的量.n=m/M=19.3/197=0.097969mol立方金块儿中所含的原子数就是0.097969×6.02×10^23=5.8978×10^22个.（b）首先要搞明白,1埃（angstrom）=10^(-10)m；另外还得有个假设,假设金原子是立方体.此金块儿...