A. A lab student analyzed his/her cool nickel-en complex for ethylenediamine, en, content. A 0.515 g sample of the synthesized Ni-en complex was dissolved in about 50 mL of water and titrated with 0.186 M HCl (aq). Endpoint required 20.16 mL of the HCl (aq). What is the mass (in grams) of en in the Ni-en complex analyzed?B. Continuing on with the analysis of the Ni-en complex as found in question (a), 40 mL of dimethylglyoxime, DMG, solution was added to the titrated nickel-en complex solution. The resulting beautiful red complex, Ni(DMG)2 was collected by filtration and found to weigh 0.487 g. What is the mass (in grams) of Ni in the Ni-en complex analyzed? C. Determine the empirical formula of the complex synthesized in questions (a) and (b) above.