A chemical reaction is shown. SnO2 + H2 - Sn + H20
What is true about this chemical reaction?
O A. It is unbalanced because the mass of the reactants is less than the mass of the products.
OB. It is balanced because the mass of the reactants is equal to the mass of the products.
O C. It is balanced because the number of reactants is equal to the number of products.
O D. It is unbalanced because the mass of the reactants is greater than the mass of the products.

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.