I need help asap. please

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

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?