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A substance has an extinction coefficient of 5 x 10^5 L cm^-1 mol^-1. A concentrated solution of this substance has an absorbance too high to measure. You dilute 1 ml of this solution to 25 ml with distilled water; the measured absorbance is 0.2. What is the concentration of the original concentrated solution?
Calculate the maximum number of grams of phosphorus trichloride that could be formed from 44.1 grams P subscribe 4.
How many grams of water are formed when 5.00 g of butanol combust with excess oxygen according to the reaction shown below?
Benzene (A) melts at 6 0C and diphenylmethanol (B) melts at 65 0C. The solids are mutually immiscible. There is a eutectic at 1 0C, the eutectic solution being 20 mol % in B, and an unstable compound, AB2,
What is the molarity of an unknown acid if 40.5 ml of the acid can be titrated
What is the concentration of the solution prepared by adding enough water to 4.00 mL of 3.25 M NaOH to make 20.00 mL total?
Calculate the pH of the solution obtained by dissolving 0.2 moles of glycine and 0.1 mole NaOH in a liter of water.
The pressure on a balloon holding 350 mL of an ideal gas is increased from 254 torr to 1.00 atm. What is the new volume of the balloon (in mL) at constant temperature?
The equilibrium constant for a reaction at 25 degrees Celsius is 4.7*10^-8. What is the change in G
Sodium borohydride reacts very slowly with ethanol to evolve a gas. Write a balanced equation for this reaction.
What concentration of C2O42- is necessary to begin precipitation? (Neglect volume changes.) [C2O42-] = M. (b) Which cation precipitates first? Cd2+ Ag+ (c) What is the concentration of C2O42- when the second cation begins to precipitate? [C2O42-] ..
Write a balanced half-reaction describing the oxidation of gaseous dihydrogen to aqueous hydrogen cations.
How much heat (in kJ) is evolved in converting 1.00 mol of steam at 130.0 degrees C to ice at -55.0 degrees C? The heat capacity of steam is 2.01J/g and of ice is 2.09j/g.
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