Problem: Use the masses of carbon dioxide, CO2, and water, H2O, to determine the empirical formula of the alkane component.A 1.566 g sample of a component of the light petroleum distillate called naphtha is found to yield 4.800 g CO2(g) and 2.292 g H2O(l) on complete combustion.This particular compound is also found to be an alkane with one methyl group attached to a longer carbon chain and to have a molecular formula twice its empirical formula. The compound also has the following properties:melting point of − 154°C ,boiling point of 60.3°C ,density of 0.6532 g/ mL at 20°C ,specific heat of 2.25 J/ (g°C) , and ΔH°f = − 204.6 kJ/ mol .

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Use the masses of carbon dioxide, CO2, and water, H2O, to determine the empirical formula of the alkane component.

A 1.566 g sample of a component of the light petroleum distillate called naphtha is found to yield 4.800 g CO2(g) and 2.292 g H2O(l) on complete combustion.
This particular compound is also found to be an alkane with one methyl group attached to a longer carbon chain and to have a molecular formula twice its empirical formula. The compound also has the following properties:

  • melting point of − 154°C ,
  • boiling point of 60.3°C ,
  • density of 0.6532 g/ mL at 20°C ,
  • specific heat of 2.25 J/ (g°C) , and 
  • ΔH°f = − 204.6 kJ/ mol .

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