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1. a. How many grams of CuSO4•5H2O are needed to prepare 100.0 mL of a 0.15 M CuSO4 solution?
b. In order to make a solution that is 0.030 M in CuSO4, what volume of the above solution should be diluted to 5.00 mL with water?
2. A 0.10 M solution of compound "B" is measured in a 1.00 cm path length cuvette at a wavelength of 500 nm. The percentage of light transmitted through the cell is 38%.
a. What is the absorbance of this sample (A) at 500 nm?
b. Assuming Beer's Law holds, what is the value of e for compound B at 500 nm?
c. A sample of compound B having an unknown concentration is measured to have an absorbance of 0.90 in a 1.00 cm path length cell at 500 nm. What is the concentration of B in this sample, assuming Beer's Law holds?
What concentration of the barium ion,Ba2+ , must be exceeded to precipitate BaF2 from a solution that is 1.00 *10 ^-2 M in the fluoride ion, F- ? Ksp for barium fluoride is 2.45 *10 ^-5.
Commensurate with the quantities of chemicals involved. Choose a distillation flask, which will be approximately half filled by the quantity of liquid you have to distil
What statement below best describes the graph representing the integrated 1st order rate law. plot of ln[a] vs t having a straight line negative slope equal to -k
A rigid tank contains 20 lbm of air at 20 psia and 70F. More air is added until the pressure and temperature rise to 35 psia and 90F
Give the balanced equation for the reaction- exothermic formation of 1 mol of sodium chloride from its elements
If an aqueous solution of Co(NO3)2 has a molar absorptivity of 5.10 L/mol.cm at 505 nm. What will be the absorbance of a 0.075 M solution
A 1.3 g sample of C3H6O is burned completely in excess oxygen to yield CO2 (g) and H2O (l) at 25 C, releasing 41.4 kJ of energy. What is the enthalpy of formation of C3H6O?
What is the value of Delta S when 2.7g of CH4 is compressed from 29.0 L to 18.0 L at a constant temperature of 100 C?
What is the pH of a solution that is prepared by dissolving 9.81 grams of acetic acid (60.05 g/mol) and 8.68 grams of sodium acetate (82.03 g/mol) in water and diluting to 800 mL.
It then gives off a photon having a wavelength of 4.10 × 102 nm. What is the final state of the hydrogen atom? Values for physical constants can be found here.
What is the pH of a solution created by mixing 183 mL of a 0.94 NaHSO3 solution with 110 mL of a 1.12 M Na2SO3 solution
Identify the relative molar amounts of the species in 0.10 M NaBr(aq). If equal, place the species in the same box. H2O OH- H30+ Br- Na+ NaBr
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