A magnesium ion, Mg2+, with a charge of 3.2×10−19C and an oxide ion, O2−, with a charge of −3.2×10−19C, are separated by a distance of 0.25 nm. How much work would be required to increase the separation of the two ions to an infinite distance?

Explanation:

Formula for work done is as follows.

           W =    

where,  k = proportionality constant =

            d = separation distance = 0.45 nm =

Now, we will put the given values into the above formula and calculate work done as follows.

         W =    

           =  

           =

Thus, we can conclude that work required to increase the separation of the two ions to an infinite distance is .

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.