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Predict the wavelength (in nm) of the lowest energy electronic transition in the dye polymethine ion. Assume all C-C and C-N bond lengths are the same and are 1.4 A (0.14 nm) and that N+1 contributes 1 π-electron and N contributes 2 π-electrons.(CH3)2N+ = CH - CH = CH - CH = CH - N(CH3)2
Four samples of gas - O2, CO2, Ar, and He - are available at the same temperature. Rank the gases in increasing order of their particles' average velocity, beginning with the slowest.
what concentration of substrate will give a velocity (v) of 62% of maximal velocity (Vmax)?
What mass in grams of CO2 was evolved? The balanced equation I set up is: Na2CO3 + 2HClO4 --> NaClO4 + CO2 + H2O Now what? What was the molarity of the excess reactant (HCl or Na2CO3)?
Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOH required for precipitation to begin in each case.
Glass is a notorious source of metal ion contamination. Three glassbottles were crushed and sieved to collect 1-mm pieces. To see howmuch Al3+ could be extracted, 200mL of a 0.05 Msolution of the metal-binding compound EDTA was stirred with 0.50 g..
Suppose that 160 g of ethanol at 30?C is mixed with 230 g of ethanol at 76?C at constant atmospheric pressure in a thermally insulated vessel.
a 250ml solution of NaOH has 20g of solute. what is the concentration in moles per litre? what is the concentration of each ion?
2 Al2O3(s) → 4 Al(s) + 3 O2(g) . ?H = +3339.6 kJ/mol What is ?H for the formation of one mole of Al2O3(s) from the elements?
Which of the following pairs has about the same atomic radius?
Titanium (III) chloride, a substance used in catalysts for preparing polyethylene, is made by high-temperature reaction of vapor with 2TiCl4+H2=2TiCl3+2HCl: How many grams of are needed for complete reaction with 150 of at 450 and 785 pressure
If the enthalpy of combustion of the compound is -2978.0 kJ/mol and the temperature of the calorimeter rises from 25.44 C to 27.7 C, how many moles of the compound were oxidized?
Calculate the Gibbs energy of the reaction (delta G rxn) at 25'C for the above rxn when all three gases are at 0.0010 atm. Kp = 1.8 x 10 ^ - 18
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