What volume of a 1.08 M solutions contains 0.642 moles of KI

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

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Which fact represents evidence for the big bang theory?