You need to calculate the enthalpy change (AHO) of the reaction A+B → C. How can the enthalpies given for the reaction steps below be combined to
give the overall change in enthalpy?
2A+BD
C+AD
AH2
O A. AH AH , +AH2
O B. AHO E AH, AH2
C. AH = AH - AH2
O D. AHORAH 2-AH

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.