Chemistry Science help!

[miceheart]

I am reading the ionic bonding chapter which they are talking about the lattice energy.

I am not quite how to exactly to calculate the ionization energy. For example:
1 mol of Li to lose 1 mol of outer electrons:
Li----> Li (+) + e- The book said the IE1 is 520 kJ, However I could not figure how they got this number.

I use the equation of E=-2.18*10(-18) J*Z(2) (1/n(final)square-1/n(initial)square). Z=3 N final=1 N initial =2

Is this is the right equation to use? also this equration is for 1 particle, therefore, for 1 mol I have to times 6.02 *10(23)

Thanks

 

[ForcedEntry]

I am reading the ionic bonding chapter which they are talking about the lattice energy.

I am not quite how to exactly to calculate the ionization energy. For example:
1 mol of Li to lose 1 mol of outer electrons:
Li----> Li (+) + e- The book said the IE1 is 520 kJ, However I could not figure how they got this number.

I use the equation of E=-2.18*10(-18) J*Z(2) (1/n(final)square-1/n(initial)square). Z=3 N final=1 N initial =2

Is this is the right equation to use? also this equration is for 1 particle, therefore, for 1 mol I have to times 6.02 *10(23)

Thanks

5.392*1.60217e^-22*6.02e^23=520kJ (this is a stoichemometry problem)

 

[TennisBoy78]

Who on here has seen this type of question on the REAL PCAT? I havent and Ive taken it twice.

 

[miceheart]

I don't know whether this is a real question on pCAT， I just felt confused when I read the book.

 

[camjames]

well i think the qualitative aspects with ionization energies/electron affinities are more important to grasp. I remember my prof stressing this fact. ie. why the first ionization energy is alot lower than the second ionization energy...I have never taken the pcat, but i think just keeping your concepts clear is probably the key.