How much 0.5 m HCl solution can be made by diluting 200 ml of 3 m HCl solution

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

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg