What is the oxidation number of chlorine? cl6

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

Astudent completes a titration by adding 12.0 milliliters of naoh(aq) of unknown concentration to 16.0 milliliters of 0.15 m hcl(aq). what is the molar concentration of the naoh(aq)? 1)5.0 m 2)0.20 m 3)0.11 m 4)1.1 m

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?