Along each row of the periodic table,
a. atomic mass increases from left to right.
b. atomic mass decreases from left to right.
c. atomic mass is the same for all elements in the row.
d. atomic mass changes in no set pattern.

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.