Which factor increases the rate of dissolution in an unsaturated solution?

The answer is increase of the temperature.

Explanation:

The rate of dissolution refers to the speed with which the dissolution can be carried out. When we increase the temperature in a solution system, we are increasing the kinectic energy of the particles, which makes the molecules move faster and adapt themselves to their new environment, dissolving the solute faster in the solvent.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.

c. 4.54 x 10–12 j happens to be correct