Cao(s) reacts with water to form ca(oh)2(aq). if 6.50 g cao is combined with 99.70 g h2o in a coffee cup calorimeter, the temperature of the resulting solution increases from 21.7 °c to 43.1 °c. calculate the enthalpy change for the reaction per mole of cao. assume that the specific heat capacity of the solution is 4.18 j/g×k.

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.