Please help I beg this is going to determine my grade for the end of the year so please what ever you do please help me and my grade

An aqueous solution of hydroiodic acid is standardized by titration with a 0.186 m solution of calcium hydroxide. if 26.5 ml of base are required to neutralize 20.3 ml of the acid, what is the molarity of the hydroiodic acid solution? m hydroiodic acid

What does the process of natural selection involve

Find the mass, in grams, of 5.00*10^23 molecules of f2