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1.) A 0.062 M aqueous sample of species y was analyzed by atomic absorption spectroscopy at 525 nm and in a 1.00-cm cell and yielded a %T value of 70.19 % . Calculate the molar absorptivity of species y.
2.)At 575.0 nm, a solution containing 0.0523 g/L CuSO4 (159.61 g/mol) in a cell of path length 1.00 cm gave an absorbance (A) of 0.2480. Calculate : a. the molarity of CuSO4 b. the absorptivity of CuSO4 units of (L/g.cm)c. the molar absorptivity of CuSO4
3.Measurements were made on a UV-VIS instrument at 525 nm.
A solution containing 0.0452 g/0.500L KMnO4 in a cell of path length 0.500 cm gave an absorbance (A) of 0.492. Calculate:
a. the ppm of KMnO4
b. the transmittance (T)
c. the % transmittance
Calculate total enthalpy change in the first stage and in both stages.
What is the rate constant of a first-order reaction that takes 8.50 minutes for the reactant concentration to drop to half of its initial value?
Which best describes a solid?
What is the concentration of the AgNO3 solution. How many grams of AgNO3 are precipitated.
What is the freezing point of a solution of aluminum chloride that contains 42.0 g AlCl3 dissolved in 530. g of water?
what is the molality of ethanol in a solution made by dissolving 14.6g of ethanol, C2H5OH, in 53.6 g of water?
The simplest formula of a substance is found to be CH2O, and its approximate molar mass is found by experiment to be 93 g•mol-1. What is its exact molar mass?
Find the pH of a 0.15 M solution of ammonia, NH3. Kb = 1.8*10^-5
Determine the boiling point of a 1.5m aqueous solution of fructose.
30.0 mL of pure water at 280. K is mixed with 50.0 mL of pure water at 348 K. What is the final temperature of the mixture? Ignore significant figures for this problem.
An unknown element, X, reacts with chlorine to form a compound with the formula XCl2. Which element is most likely to be element X?
Hard water contains Ca2+, Mg 2+, and Fe2+. Water softeners replace these ions with Na+. If 1.0 X 10^3L of hard water contains 0.010 M Ca2+ and 0.0050 M Mg2+
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