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现行高中物理教材（必修）第一册第３２４页第５题：如图１所示，食盐（ＮａＣｌ）的晶体是由钠离子（图中Ｏ）和氢离子（图中 ）组成的．这两种离子在空间中三个相互垂直的方向上等距离地交错排列着．已知食盐的摩尔质量是 ５８．５ｇ／ｍｏｌ，食盐的密度是 ２．２ ｇ／ｃｍ
The current high school physics textbook (required) Volume 1, Page 324 Question 5: As shown in Figure 1, the salt (NaCl) crystal consists of sodium ions (O in the figure) and hydrogen ions (in the figure). The two ions are staggered at equal distances in three mutually perpendicular directions in space. It is known that the salt has a molar mass of 58.5 g/mol and the salt has a density of 2.2 g/cm.