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The molar extinction coefficient of benzene equals 100 M-1cm-1 at 260 nm. Assume this number is independent of solvent. (a) What concentration would give an absorbance of 1.0 in a 1 cm cell at 260 nm? (b) What concentration would allow only 1% of 260 nm light to be transmitted through a 1 cm cell? (c) If the density of liquid benzene is 0.8 g/cm3, what thickness of benzene would give an absorbance of 1.0 at 260 nm? A) Absorbance is A = c so c = A/.
A sample of oxygen that occupies 2.5 × 10-6 mL at 508 mm Hg is subjected to a pressure of 1.2 atm. What will the final vol ume of the sample be if the temperature is held constant?
What is the volume of a sample of chlorine gas with a density of 0.0032 g/cm3 and a mass of 1.45 g?
Two particles with charges q1 and q2 are separated by distance d. Rank these scenarios according to the magnitude of the electrostatic (coulombic) potential energy.
HCL acid solution is standardized using 0.502g of sodium carbonate. Find the molarity of the acid if 30.5mL are required for the titration.
A laser pulse with wavelength 555 contains 4.40 of energy. How many photons are in the laser pulse?
what is the molarity of a saturated solution of AgOH with a Ksp = 2.0 x 10^ -8
If the pressure exerted by ozone, {rm{O}}_3, in the stratosphere is 3.0 times 10^{ - 3} {rm{atm}} and the temperature is 251 K, how many ozone molecules are in a liter?
For the reaction 2 HCl + Na2CO3 → 2 NaCl + H2O + CO2 what volume of 0.45 M HCl solution would be needed to produce 2.5 L of CO2 at STP
Using A sample having X amount of oxalic acid. If 0.5187 grams of the sample requires 40.20 mL of 0.1000 M Sodium hydroxide to neutralize the oxalic acid completely.
What is the half-life of a compound if 89 percent of a given sample of the compound decomposes in 56 min? Assume first-order kinetics.
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
Two unknowns X and Y both having molecular formulas C4H8O, give the following results with four chemical tests. Propose structures for X and Y consistent with this infomation, Bromine Na Metal Chromic Acid Lucas Reagent
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