weight percentage of nitrogen can be calculated using the following rule: weight percentage of nitrogen = (weight of nitrogen / weight of urea) x 100
From the periodic table: molecular mass of carbon = 12 grams molecular mass of nitrogen = 14 grams molecular mass of hydrogen = 1 grams molecular mass of oxygen = 16 grams
therefore: mass of nitrogen in urea = 2(14) = 28 grams mass of urea = 12 + 2(14) + 4(1) + 16 = 60 grams
Substitute with the masses in the equation to get the percentage: weight percentage of nitrogen = (28/60) x 100 = 46.667%
