Question 43 of 44 General Chemistry 4th Edition niver sity Science Book method c

Question

Question 43 of 44 General Chemistry 4th Edition niver sity Science Book method called the The amount of nitrogen in an organic substance car he determined by an a Kjeldahl method, in which all the nit ammonia, which is a weak base, can be neutralized vith hydrochloric acid, as d in the org ric substance is con to ammonia. The by the NH.aq) + HCI(aq) NH,Clag) If 30.0 mL of 0.150 M Hcl(aq) is needed to neutraliz s all the NH(g) from a 2.25-g sample of organic material, calculate the mass percentage of nitrogen r the sample. Number

Explanation / Answer

1 MOL nh3 = 1 MOL HCl

NO OF mol of HCl reacted = V*M/1000

       = 30*0.15/1000

       = 0.0045 mol

NO OF mol of NH3 reacted = 0.0045 mol

   1 mol NH3 = 1 mol N

mass of N in sample = 0.0045*14 = 0.063 g

% of Nitrogen in sample = 0.063/2.25*100

           = 2.8%

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