How to find density of a compund

  • Thread starter Iyafrady
  • Start date
I want to find the ensity of NaCl given the atomic weight of Na is 23 and that of Cl is 35.5.The ionic radius are 1A and 1.8A respectively.I foundthevolume of each element to be Vna=4.2A^3 and Vcl=24.4A^3.

V(NaCl)=28.6E-23
MASS(NaCl)=[(23+35.5)g/mole]*(1/avogadros number)=9.7E-23
So D=m/v=(9.7E^-23)/(28.6E-23)=3.39

but this is way off from the listed density of 2.17g/cm^3....dont know what im doing wrong.
 

Borek

Mentor
27,870
2,447
There is a lot of space between those spheres, you know...

You have to calculate volume of the unit cell.
 

Want to reply to this thread?

"How to find density of a compund" You must log in or register to reply here.

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Top Threads

Top