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An unknown solution containing Yellow five dyes displays an absorbance reading of 0.628. Explain the molar extinction coefficient for Yellow 5 dye is 27300 L/mol cm. Explain what is the concentration (in M) of Yellow five in the unknown solution?
A drug with the molecular formula C25H38O5 has 2.14 x 10^23 carbon atoms. What is the mass of the sample?
What is the (a) molality, (b) freezing point, (c) boiling point of a solution containing 100.0 g of ethylene glycol (C6H6O2) in 150.0 g of water
For the H2PO4- -HPO4-2 bufer system, pka=7.21. If the pH of a urine sample is 5.6 and its total phosphate concentration is 46.6mmol/L, calculate the concentration of each phosphate species in the sample.
What mass of sucrose should be combined with 521 of water to make a solution with an osmotic pressure of 8.15 at 285 ? (Assume the density of the solution to be equal to the density of the solvent.)
calculated the concentration of B-Carotene in your 2.00mL sample to be 2.082x10-6 M, how many grams of B-Carotene are in your sample?
What pair of elements would you expect to exhibit the greatest similarity in physical and chemical properties. WHY.
1. Explain how to use Lewis electron-dot symbols to depict main-group atoms and ions. 2. How to explain the electronic structure of ions using electron configurations and Lewis electron-dot symbols.
The rate constant increases by a factor of 2.00 when the temperature is increased from 80 C to 115 C. estimate the arrhenius activation energy.
Compression and Cooling of Nitrogen Gas. A volume of 65.0 ft^3 of N2 gas at 90°F and 29.0 psig is compressed to 75 psig and cooled to 65°F.
a 25 ml sample of .147 m propionic acid hc3h5o2 is titrated with .104 m koh solution. the equivelence point is reached
If all the chloride in a 5.000g sample of an unknown metal chloride is precipitated as silver chloride with 70.90mL of 0.2010M silver nitrate, explain what is the percentage of chloride in the sample
A 45.0-L steel tank at 20.0°C contains acetylene gas, C2H2, at a pressure of 1.39 atm. Assuming ideal behavior, how many grams of acetylene are in the tank?
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