Someone, please explain the reaction at the electrodes at concentrated hydrochloric acid

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

How many grams of n2h4 will be consumed by 23 g of n2o4

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder