Please Help me with number 4 I really need help please just tell me which letter is

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

Calculate the molarity of each of the following solutions. part a) 0.12 mol of lino3 in 5.5 l of solution part b) 60.7 g c2h6o in 2.48 l of solution part c) 14.2 mg ki in 100 ml of solution

Are oil and water a mixture or solution