Share
Explore BrainMass

Explore BrainMass

  1. Chemistry
  2. Organic Chemistry
  3. Organic Reactions
  4. 7387

Calculating the molecular formula of an organic compound

 1 dm3 of hydrocarbon A at 1 atmosphere pressure is shown to have a mass of 2.333g. Given that the molar volume of a gas at S.T.P (ie 25°C, 1 atm) is 24 dm3.

Please answer the following:

1) Calculate the molecular formula of A

2) A is a member of which homologous series?

 15 cm3 of a mixture of gaseous hydrocarbon A and methane is combusted in the presence of excess oxygen, write balanced equations to show the complete combustion of A and of methane.

Are the reactions that you have described exothermic or endothermic?

 After the combusted mixture was cooled to room temperature the new volume of gas was recorded. When this remaining volume of gas was passed through aqueous sodium hydroxide the volume of gas decreased by 30 cm3.

Using this information, calculate the composition of the mixture.

Solution Preview

SOLUTIONS

1) 1 mole of a gas at S. T. P. occupies 24 dm3. Let x be the Mol. Wt. of the hydrocarbon,

So,
x : 24 = 2.333 : 1

and x = 24 x 2.333

x = 55.992 or 56

From this molecular weight we can ...

Solution Summary

The expert calculates the molecular formula of an organic compound.

$2.19

Related Solutions

Thermodynamics and pH

... 1) How to calculate the molecular formula of a compound ... to use Hess's law to calculate
enthalpy and ... 6) How to calculate the equilibrium constant of a reaction ...

Ester Reduction Questions

... 8. A sample of 150 mg of an organic compound is dissolved in ... Calculate the specific
rotation for the compound ... Compound B has the molecular formula C5H12O and is ...

various chemistry problems

... the bond energies of Table 4.1 to calculate the energy ... but readily soluble in most
organic solvents ... solubility behavior based on its structural formula found at ...