Calculating the molecular formula of an organic compound. Worked example, using fundamental formula and balanced equations.

 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 ... click for more

A table of observations made by a student who performed chemical tests on some unknown salts. Identify the unknown salts from the recorded observations

Using the information in the attached table, please answer the following: 1) Identify the compounds 1-5 2) For each compound that you identify support your decision with explanations for the given observations, also with equations for each reaction.

Problem: A flow chart detailing some reactions of an Ester. Solution: Details the missing parts of the flow chart and provides answers to related questions.

Using the flow chart provided (see attachment Brainmass Problem 6). Please answer the following. 1) Give the structures and names of compounds 1-7. 2) Estimate the pH of compound 3? 3) Explain with an equation the reaction in which compound 4 is changed to 6 4) What are the key differences between the hydrolysis of an ester a)in acidic and b)in basic media. What are the products of ester hydrolysis?

Relationships between wavelength, frequency, and energy of light.

A certain colour of light has a wavelength of 550 nm. What is the energy possessed by a photon of such light? (a) 2.42 x 10E-19 (b) 5.45 x 10E14 J (c) 3.61 x 10E-14 J (d) 3.61 x 10E-19 J (e) 5.37 x 10E-19 J

Relationships between wavelength, frequency, and energy of light

Calculate the frequency, in units of "per second", of light with a wavelength of (a) 540 nm, and (b) 650 nm.