What active transport?(ik the answer just wanted to give free points :^)

What’s the percent by mass of carbon in c10h14n2

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.