Chemistry Analyzer
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Chemistry---Combustion Analyzer?
Elementary analysis showed that an organic compound contained C, H, N, and O as its only elementary constituents. A 1.279g sample was burned completely, as a result of which 1.60g of CO2 and 0.77g of H2O were obtained. A separately weighted 1.625g sample contained 0.216g nitrogen. What is the empirical formula of the compound?
moles C = 1.60 g/ 44.0098 g/mol= 0.0364
mass C = 0.0364 x 12.011 g/mol= 0.437 g
moles H = 2 x 0.77 / 18.02 g/mol= 0.0855
mass H = 0.0855 x 1.008 g/mol= 0.0862 g
mass N in 1.279 g = 0.216 x 1.279 / 1.625 = 0.170 g
moles N = 0.170 g / 14.0067 g/mol= 0.0121
mass O = 1.279 - ( 0.437 + 0.0862 + 0.170)= 0.586 g
moles O = 0.586 / 15.9994 g/mol= 0.0366
C 0.0364 H 0.0855 N 0.0121 O 0.0366
divide by the smallest number
C3 H 7 N O3 is the empirical formula
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January 12th, 2008 in
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