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Carotenoids, present in all organisms capable of photosynthesis, extend the range of light absorbed by the organism. They exhibit maximal capacity for absorption of light in the range of 440-470nm.
Quinine in a 1.664 g antimalarial tablet was dissolved insufficient 0.10 M HCl to give 500 mL of solution . A 20.00 mLaliquot was then diluted to 100.o mL with the acid.
The maximum safe current in a copper wire with a diameter of3.0 mm is about 20. amperes. In a STM, a current of 7.5x10-10 Apasses from the tip to the surface in a filament of diameter appox1.5 nm.
Graphite is burned in oxygen to give carbon monoxide and carbon dioxide. if the product mixture is 33% CO and 67%CO2 by mass, what is the heat from from combustion of ig og graphite?
Give the Equations representing the first and second dissociations of tartaric acid. Calculate the value of the firstdissociation constant, K1, for tartaric acid if the value of the second dissociat
Explain why the pure solvent shows a level horizontal curve as solidification occurs, but the curve for the solution slopes downward slightly.f
Based on the above chemical reaction the activation energy wasd etermined to be 80.8 kJ/mol and the rate constant was determinedto be 6.9x10^ -3 at 40 degrees Celcius.
A 260.0 mL buffer solution initially contains2.5×10-2 Mof HCHO2 and2.5×10-2 M of NaCHO2. Inorder to adjust the buffer pH to 4.20, you should add NaOH to the buffer mixture. What mass of
You want to make an acetic acid/acetate buffer, pH 5.6, with avolume of 250 mL, and a final concentration of ([AcOH] +[AcO-]) = 0.1 M. You may only use acetic acid and sodium acetate (no strong acid
In your house (elevation 950ft above sea level) you have a barometer that registers inches of mercury. On an average day in january, the pressure was 0.966 bar on 700 ft elevation. what is the corre
Sulfur trioxide can be removed from the exhaust gases of powerplants by reaction with lime according to the equation,CaO(s)+SO3(g)--> CaSO4(s), withΔHo= -886kJ. If 240 kg of SO3 is to bere
A runner generates 418 kJ of energy per kilometerfrom the cellular oxidation of food. The runner's body mustdissipate this heat or the body will overheat. Suppose that sweatevaporation is the only i
What is the activation energy of a reaction if its rate constant at 35 C was double the value of the rate constant at 25 C?
If 10.08 g of coppermetal is heated strongly in air, the sample gains 2.49 g of oxygen in forming an oxide. Determine the empirical formula for this oxide.
How much energy is required to vaporize 125g of benzene,C6H6, at its boiling point, 80.1 degreescelsius? The heat of vaporization of benzene is 30.8kJ/mol. Specific heat of benzene is 1.74J/gC.
Write the mechanism for the reaction of the elimination reaction of 2-iodo-1,1-dimethylcyclopentane with H2O and provide the final major product.
A container contains oxygen, neon and helium whose partialpressure are 100 torr, 300 torr and 200 torr respectively. What is the mole fraction of neon?
A 0.421-g sample of asprin prepared in ther laboratory isdissolved in 95% ethanol, diluted with water, and titrated to the phenolphthalein endpoint with 17.3 mL of 0.114 M NaOH.
Formic Acid, HFor, has a Ka value equal to about 1.8 X10-4. A student is asked to prepare a bufferhaving a pH of 3.40 from a 0.10 M HFor and a 0.10 M NaForsolution.
A 25.0 mL aliquot of 0.211 M citric acidsolution is titrated with 0.143 M sodiumhydroxide solution. If the balanced titration reaction equationis:
Consider the cis trans isomers of 1,3-di-tert-butylcyclohexane. What unusual feature accounts for the fact that one of these isomers apparently exists in a twist-boat conformation rather than a chai
Dinitrogen pentoxide undergoes first order decomposition inchloro form solvent to yield nitrogen dioxide and oxygen gas. Therate constant at 45 degrees Celsius is 6.2*10-4/min.
When 1 of a fuel is burned at constant pressure, it produces 3450 of heat and does does 11 ofwork.What is the value of delta e and h for the combustion of the fuel?
A compound having an approximate molar mass of 120-15 g has the following percent composition bymass: carbon, 38.44%; hydrogen, 4.839%;chlorine, 56.73%.
A mixture containing only AgCl and AgBr weighs 2.00 g. It isquantitatively reduced to silver metal, which weighs 1.30 g.Calculate the weight of AgCl and AgBr in the original mixture.