Explain why , in the titration of a weak acid with a strong base , pH = pKa and 1/2 the volume to the equivalence point

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

How many moles of co2 are produced during the complete combustion of 3.6 moles of c2h6

What is the scientific name for weight?