Similarly the total number of molecules present in one mo of a substance is always 6.02 x 10^23 molecules. This number is called Avogadro’s number. 1 gram mol = 6.02 x 10^23 molecules. Therefore in all calculations involving gases, it is convenient to determine the moles of gas required and then to convert it into volume measurement. Infact it is expected from a chemical engineer to convert the given weight measures for a chemical reaction into moles and then determine the quantities of products or reactants, as the case may be.
The gist of the problem was apparently the lithium batteries catching fire. Now, under normal circumstances, this rarely happens, to genuine Hoverboards made by reputable manufacturers. But evidence shows that the mobility vehicles catching fire used cheaper, imitation parts in its charger, circuitry and batteries. Almost 100% of hoverboards
The second beaker was filled with an acidified 1.0 M FeSO4 solution (25cm3) as the electrolyte. Iron nail and copper were cleaned with emery paper. Copper electrode was placed into the CuSO4 solution. Iron electrode (iron nail) was placed into ZnSO4. Anode was attached to iron electrode and cathode was attached to copper electrode of voltmeter to measure a voltage.
The range of the first trial is 89.5oC – 91oC, and the range of the second trial is 90.5oC – 93.5oC. According to page 58 in the lab manual, the closest possible substances it could be are t-butyl alcohol, cyclohexene, tetrahydropyran or isooctane. PubChem says that the molecular formula for t-butyl alcohol is C4H10O, and it has a boiling point of 83oC. Cyclohexane has a boiling point of 83oC also and a molecular formula of C6H10.Tetrahydropyran has a boiling point of 88oC. PubChem states the molecular formula for tetrahydropyran to be C5H10O.
The cell was assembled and was placed carefully into a two litre beaker of water at room temperature. The zinc anode was placed into a solution of zinc sulfate (ZnSO4). A 10 cm3 solution of ferrocyanide and ferricyanide in a 50/50 ratio (i.e. 5 cm3 of ferrocyanide and 5 cm3 of ferricyanide) was made up and was placed in the other half-cell, along with the platinum cathode. These two electrodes were connected to the potentiometer.
L.H2O yields [ZnL3](ClO4)2.0.75THF.5H2O but L gives [ZnL3](ClO4)2.4H2O the same complex obtained by aminolysis of [ZnL3](ClO4)2.2H2O by 4-methoxyaniline in water. Such selectivity is not common in inorganic synthesis [9.10]. We have found that two diastereomers are obtained when L.H2O is reacted with Ru(phen)2Cl2.2H2O in equimolar proportion in 1:1 (v/v) methanol-water mixture under refluxing condition to synthesise [Ru(phen)2L](ClO4)2.2H2O. This conclusion is based on the observation of two methyl signals in the
The attractiveness of CNG as a clean, cost effective and stable source of fuel for vehicles is not only being embraced in Trinidad and Tobago, but across the globe as well. Progressive companies have embraced CNG as a fuel, which reduces their operating cost and is in harmony with worldwide efforts to reduce carbon emissions. CNG runs at almost one third to half the cost of gasoline/diesel based on an Energy-Equivalent measure. Furthermore, natural gas combustion delivers twenty percent (20%) lower carbon emissions and about twenty five percent (25%) reduction in greenhouse gases. (http://www.popularmechanics.com/cars/how-to/a7487/should-you-convert-your-car-to-natural-gas/) Before the introduction of Compressed Natural Gas (CNG) as a fuel, and CNG engines, there were steam and coal engines, which then evolved into today’s Gasoline and Diesel Engines and Fuels.
The external gear pump is much cheaper for low and moderate pressures and efficiencies, but it has drawback that when the pressure increases the noise level also increases. The piston pumps have long life and high operating pressure range. Their life expectancy is upto 40,000 hours when operated at the pressure range between 190- 250 bar. Life expectancy decreases with increase in operating pressures. From the study of above factors it is concluded that the gear pumps have moderate pressure operating capacity and there is no any pressure pulsation occurrence during the operation of pump as the piston pumps and vane pumps have high pulsation as compared to the gear pumps.
The large compression rate permits the air in the cylinder to gain warmth in order to ignite the fuel. Opponents of diesel engines have asserted that diesel vehicles emit 10 times more nitrogen oxides than non-diesel cars, diesel vehicles don’t offer high-speed performance, and that they need to be repaired more frequently in the short term so they are able to continue operating. Contrary to that, diesel engines are a better option because they
In spitghe of these advantages the use of PEM fuel cells has became restricted due to their high cost, which is due to the usage of platinum-based catalyst and Nafion polymer membrane in the fuel cell.The United States hasbeenspendingmillions of dollars on research and development of PEM fuel cells. The main areas of research are the search for alternative and cheaper catalyst, increasing the operating temperature and increased the working