The first ionisation energies of an element are given below: 520 kJ/mol
7297 kJ/mol
11810 kJ/mol
12560 kJ/mol
If this were in period 2, which element would this most likely be? Explain why.

What is the value of keq for the reaction expressed in scientific notation

When a septic tank backs up a goes in to clean it out

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.