There is absolute certainty in the processes of science true or false

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Explain what happens at the saturation point when adding salt to water at room temperature.

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.