Balancing Chemical Equations Video Lessons

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Concept: Balancing Chemical Reactions

Problem: Calculate the enthalpy of combustion, ΔH°comb, for C6H14. You'll first need to determine the balanced chemical equation for the combustion of C6H14.Express your answer to four significant figures and include the appropriate units.Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. Hydrogen atoms are added for you.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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Problem Details

Calculate the enthalpy of combustion, ΔH°comb, for C6H14. You'll first need to determine the balanced chemical equation for the combustion of C6H14.

Express your answer to four significant figures and include the appropriate units.


Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. Hydrogen atoms are added for you.

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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