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(1) A sample containing 0.0250 M concentration of a dye in a cell of 1 cm2 cross section has a measured absorbance of 1.012 at 650 nm. Calculate the instrumental constant "k" for the spectrophotometer at that wavelength. (2) A sample of the same dye in the same cell and spectrophotometer has a measured absorbance of 0.672 at the same wavelength. Calculate the dye concentration. (3) 5.00 mL of 0.00500 M ferric nitrate is added to 5.00 mL of nitric acid and 10.0 mL of 0.00250 M thiocyanate solution. Calculate the initial Fe3+ concentration before reaction.
construct an energy level diagram (molecular orbital) for the molecule SO. We are then asked to comment on the ionic species of SO - bond order, bond distance etc. So far so good.
A small bubble rises from the bottom of a lake, where the temperature and pressure are 8ºC and 6.4 atm, to the water's surface, where the temperature is 25ºC and pressure is 1.0 atm.
1.00 x 10-2 M Mg(NO3)2 and 250 ml of 1.00 x 10-1 M NaF.Calculate the concentrations of Mg2+ and F- at equilibrium with solid MgF2 (Ksp of MgF2 = 6.4 x 10-9).
At 0°C, the volume coefficient of expansion of mercury is α = 18×10-5 K-1, and its coefficient of compressibility is β = 5.32×10-6 bar-1.
When sodium carbonate reacts with hydrochloric acid, the carbonic acid that is formed immediately breaks down into carbon dioxide and water.
determine the specific heat capacity of a metal that has a mas of 14 grams. As the metal cools from 400 degrees celcius to 200 degrees celcius, 364 joules of heat is released
Determine the initial quality and temperature of the fluid mixture prior to heating. [quality x1 = 0.182, T1 = 113.3°C] b) Determine the final volume of the steam after heating. [0.546 m3 (546 liters)] Note: 1000 liters - 1 m3
a chemical reaction release 1240 J of energy. the energy is all absorbed by water (423 g) containing the reactants. if water was initially at 19.6 degrees, what will be it final temperature
Find out the concentration of this solution in a)M (molarity), b) m (molality), c) % w/w (percent by mass). If solvent =, H 2 O.
According to the above expression how many moles of KHC8H4O4 are needed to neutralize 25.00 mL of 0.10 M NaOH
Description of Alkene Halogenation, What is the major product formed when 1-pentene is reacted with br2 in aqueous solution and why?
Nitrogen and hydrogen gases react to form ammonia gas as follows: N2(g)+3H2(g)-->2NH3(g) At a certain temperature and pressure, 1.7 L of N2 reacts with 5.1 L of H2. If all of the N2 and H2 are consumed, what volume of NH3(g) is produced at the sam..
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