C) energy level
Looking at quantum mechanics, we see that electrons exist at certain energy levels. When they get excited, they’ll jump from one energy state to a higher energy state and down. We can the. Look at the color it admits and determine what the energy level is.
The answer is c, visible light
First calculate the no of moles, that is 38 grams divided by molar mass which is 58.43 g/mol. The no of moles is 0.65 moles. Concentration= no of moles divided by volume in litre. From the above formula, volume= no of moles divided by concentration. So to get the total volume 0.65 moles divided by 0.02M (mol/L) which gives 32.5 L.