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,

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