0.90g of an organic compound containing only carbon,hydrogen and nitrogen on combustion gave 1.1 g CO2 and 0.3 g water. What is %C,%H and %N in the organic compound??
Mass of H2O = 0.3 g
Mass of CO2 = 1.1 g
Mass of compound = 0.90gm
Molar mass of CO2 = 44g
Molar mass of H2O = 18g
44 g of CO2 contains 12 g carbon
1.1 g CO2 contains = 0.3 g carbon
Similarly,
18 g H2O contains 2 g hydrogen
Therefore, 0.3g of H2O contains = 0.033g hydrogen
Grams of N in the compound = 0.90 – 0.3 – 0.033 = 0.567g
Therefore,