Why do we need Chemistry in Nursing?

On a distance vs time graph the line of an object at rest is a

Which statement correctly describes potassium iodide, ki? there is a one-to-one ratio of potassium ions to iodide ions. potassium gains electrons and iodine loses electrons during the reaction. the lattice is held together by potassium anions and iodide cations.

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