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a) The three molecules naphthalene (C10), anthracene (C14), and tetracene (C18) have spectra shown below. Note that the y-axis is base 10 logarithmic with units of M-1 cm-1. If anthracene is used as a sunblock in sunglasses 1 mm thick, what concentration is needed to get99% absorbance?
(b) Which molecule(s) are likely to be colored?
(c) Using elementary quantum principles, explain why tetracene absorbs at the longest weavelength
Assume the density of the vinegar solution is 1.00 g/mL and 5.00% by mass acetic acid. Determine the volume of vinegar that can be neutralized with 25.0 mL of 0.100 M NaOH.
How much heat is required to heat 410g of copper from 25degree C to 200degree C?
The below table lists pressure and volume measurements for air in a cylindrical piston of an air compressor. The variables may be assumed related by: PV^k=C
Calculate the capacity factor for decane on HP-1 column (25 m length, 0.25 mm I.D., 0.5 mkm film thickness) at 120 C. Explain.
Calculate the pH at the equivalence point in titrating 0.100 M solutions of each of the following with 0.080 M NaOH: (a) hydrobromic acid (HBr), (b) chlorous acid (HClO2), (c) benzoic acid (C6H5COOH)
In 1.00 atm of pure oxygen, the solubility of O2(g) in water is 1.26 x 10^-3 M at 25.0 degree C. The mole fraction of oxygen in air is 0.210. If the atmospheric pressure is 0.979 atm, what is the solubility of oxygen in air at 25.0 degree C?
The background section describes why you want the bleach to be far in excess of the dye. State how much greater the bleach should be to be considered in large excess. If the due is 1 x 10-5 M how much can the bleach be diluted before you no longer..
an antifreeze solution prepared by mizing equal volumes of ethylene glycol, C2H6O2 (density 1.12g/cm^3) with water (density 1.00 g/cm^3). Estimate the freezing point of the mixture
Which of the following statements concerning the determination of crystal structure by x-ray diffraction is incorrect? X-rays are reflected from the repeating planes of an ordered crystal lattice
A buffer solution of pH 5.3 is to be prepared from propionic acid and sodium propionate. The concentration of sodium propionate must be 0.50 M. What should the concentration of propionic acid be? Ka = 1.3 X 10-5
What difference would you predict would occur in the graphing of the data if carbon dioxide was used instead of the components of air?
The unit cell of platinum has a length of 392.0pm along each side. Use this length and your answer from part a (14 particles in unit cell, coordination #=12, 4 unique particles per unit cell) to calculate the density of platinum metal in kg/m3
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