Pair Solid
Posted in Garden Antiques on 06/04/2009 10:53 am by adminCalculation of electrical energy of ions in KCl solid?
Hi,
I have this question.: In KCl solid ,the distance between each K+ and Cl- ion is 320pm.Calculate the attractive electrical energy for this pair of ions.
We can use this formula Kq1q2/r2
But i don't know what would be the value of q1 and q2 ?
The formula you gave for the electrical potential energy is incorrect. This is for the force between the ions. The electrical potential energy is
E = kq1q2/r
Since K+ and Cl- ions, each have a +1 and -1 charge, respectively, you would just use the unit charge (e = 1.6 *10^-19 C) for q1 and q2. The +/- signs do not matter here since we are computing energy.
Thus,
E = (9 * 10^9)*(1.6 *10^-19)^2/(320 *10^-12) J
= 7.2 * 10^-19 J
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