Neutralization of 21.17 mL of 0.5000 M NaOH required 42.35 mL of H2SO4. What was the concentration of H2SO4

The answer is b on plato.

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.