Wednesday
November 26, 2014

Homework Help: Chemistry

Posted by Jay on Monday, April 18, 2011 at 7:17pm.

Calcium fluoride is the well-known mineral fluorite. It is known that each unit cell contains four Ca2+ ions and eight F- ions and that the Ca2+ are arranged in a face-centered cubic lattice. The F- ions fill all the tetrahedral holes. The edge of the CaF2 unit cell is 5.46295 x 10^-8
cm in length. The density of the solid is 3.1805 g/cm^3. Use this information to calculate Avogadro's number.

I am completely lost on what to do. Here is what I have tried to do so far.



5.46295 x 10^-8 cm (taken to the third power)= 4.63035 x 10^-22 cm^3.

Then I utilized the density to convert to grams.

1.63035 cm^3 x 1g/3.1805 cm^3 = 5.1261 x10^-23 grams

Here is where I get lost. I tried using the molar mass of CaF2, but it's not equal to Avogadro's number.

Any pointers would be greatly appreciated!

Thank you,

Jay

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry help- - Which of the following has the lowest second ionization energy...
Chemistry - An ion exchange process may be used to remove ions causing hardness ...
Chemistry - 0.02 g of CaCO3 is dissolved in 1 L of water. Calculate the moles of...
college - 0.02 g of CaCO3 is dissolved in 1 L of water. Calculate the moles of ...
chemistry - The concentration of calcium ions in hard water can be determined by...
Chemistry - Your muscles are switched on by releasing calcium ion from the ...
chemistry - A solution contains 1.72 10-3 M Ca(NO3)2. Determine the mass of the ...
Chemistry - What is the maximum concentration of Ca2+ ions in a solution ...
chemistry, science - Carbon is also removed from the atmosphere during the ...
Chemistry - The following equations are intepretations of the evidence from the ...

Search
Members