Kjeldahl analysis involves the following steps:

i) Degradation: Sample + H2SO4 (NH4)2SO4(aq) + CO2(g) + SO2(g) + H2O(g)

ii) Liberation of ammonia: (NH4)2SO4(aq) + 2NaOH Na2SO4(aq) + 2H2O(l) + 2NH3(g)

iii) Capture of ammonia: HCl + H2O + NH3 NH4+ + Cl

iv) Back-titration of remaining HCl by NaOH

A sample of about 0.1kg of compost made from biowaste was taken for analysis. After drying to remove moisture the sample had a mass of 55.13 g. A 1.000 g sample of the dried compost was taken for Kjeldahl analysis to determine its nitrogen content. The ammonia gas generated when ammonium was neutralized in step (ii) was distilled into 100.00 mL of 0.1000 M HCl to reform ammonium (step iii). If 73.69 mL of 0.1000 NaOH is required to back titrate the unreacted HCl (step iv), calculate the percent by mass of nitrogen (dry weight) in the original sample of soil.