Very basic question

[vDDmaniaC]

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If there is 39g of Calcium fluoride (78amu) then
how many each moles of ion are there?

CF2

since the 39g is 0.5 mole of molecule,
does it mean it has half a mole of Calcium ion and 1 mole of Fluoride ion?

Then how the molecule moles are affected based on different mole of ions?

I thought I knew it. But I guess I focused too much on what I known but not what I lack of.

 

[whoaaitzkyle]

If there is 39g of Calcium fluoride (78amu) then
how many each moles of ion are there?

CF2

since the 39g is 0.5 mole of molecule,
does it mean it has half a mole of Calcium ion and 1 mole of Fluoride ion?

Then how the molecule moles are affected based on different mole of ions?

I thought I knew it. But I guess I focused too much on what I known but not what I lack of.

I don't know if I understand the question correctly, but here's how I'm interpreting your question.

CaF2 ---> Ca2+ + 2F-

You start with 0.5 moles of CaF2. By comparing the stoichiometric ratio of CaF2 to the respective ion you are looking for you can derive how many of each moles you have. In this case:

0.5 moles CaF2 x (2F- / 1mole CaF2) = 1 moles of F-

and do the same for the Ca2+ ion. Hope that helps