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Calculate moles of each element - divide
% by atomic mass
C=19.998/12.011 = 1.665
H= 3.331/ 1.008 = 3.305
N= 23.320 / 14.007 = 1.665
O= 53.302 / 15.999 = 3.332
Divide through by smallest
C=1
H=2
N=1
O = 2 ( small rounding is accepted)
Empirical formula = CH2NO2
Formula mass = 12.011 +1.008'2 + 14.007 + 15.999:2 = 60.03 g/formula unit
Formula units in 1 molecule = 120.07 /
60.03 = 2
Molecular formula = ( CH2NO2)2 = C2H4N204 (1,2-dinitroethane.)
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