Acarbon nanotube is a sheet of graphite rolled into a tube as shown. they were discovered in 1992 by accident and represent extremely exciting new materials since they are very strong (100 times the tensile strength of steel), can store hydrogen, and are excellent candidates for new electronic displays. they are made by a variety of techniques, one of which is the catalytic decomposition of ethane over cobalt and iron catalysts supported on silica. the two relevant reactions that occur simultaneously are: c2h6 → 2c + 3h2 c2h6 → c2h4 + h2 if you collect 3 kmol/h of h2 and 0.5 kmol/h of c2h4 during the production what is the selectivity of carbon nanotubes (c) relative to ethylene (c2h4)?

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.