The following data were reported [from C. N. Hinshelwood and P. J. Ackey, Proc. R. Soc. (Lond)., A115, 215] for a gas-phase constant-volume decomposition of dimethyl ether at 504C in a batch reactor. Initially, only was present. Run 1234 5 (min) 15 38 100 300 1200 1.5 1.25 1.0 0.75 0.5 t (min) 0 5 9 15 22 30 40 60 CA (mol/dm3) 2 1.6 1.35 1.1 0.87 0.70 0.53 0.35 Time (s) 390 777 1195 3155 Total Pressure (mmHg) 408 488 562 799 931 dm3 t CA mol/dm3 ( ) t A BC → CH3 ( )2O 290 Collection and Analysis of Rate Data Chapter 7 (a) Why do you think the total pressure measurement at t 0 is missing? Can you estimate it? (b) Assuming that the reaction is irreversible and goes virtually to completion, determine the reaction order and specific reaction rate k. (Ans.: k = 0.00048 min–1) (c) What experimental conditions would you suggest if you were to obtain more data? (d) How would the data and your answers change if the reaction were run at a higher temperature? A lower temperature?

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

b.final

your mom.com . : 0000