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A certain weak base has a Kb of 7.80 × 10-7. What concentration of this base will produce a pH of 10.16
consider two ZAMS stars: 09 and B0. The effective temperature of the 09 star is 34,500 k. Assuming a hydrogen density of 10^8 m^-3, and Alpha = 3.1 x 10^-19 m^3 s^-1, estimate the Stromgren radi
water flowing through pipes of carbon steel must be kept at PH 5 or greater than limit corrosion if an 8.0 *10^3 Ib/hr water stream contains 10 ppm sulfuric acid and 0.015% acetic acid, how many pou
k=2,2 . 10^-3 for the following rxn: 2H2S(g)2H2(g) + S2(g) a) calculate the synthesis of one mole of H2S from H2 and S2 gases b) the decomposeosition of one mole of H2S gas
What is the mole fraction of ethanol in this solution. Sdduming ideal-solution behavior, what is the vapor pressure of the solution at 63.5 C. What is the mole fraction of ethanol in the vapor above
A solid disk of mass m1 = 9.3 kg and radius R = 0.23 m is rotating with a constant angular velocity of ? = 33 rad/s. find the initial angular momentum of the rod and disk system
Calculate the number of moles of oxygen gas produced from the completely catalyzed decomposition of 6.20ml sample of a 3.5% solution of H2O2. The density of the 3.5% solution of H2O2 is 1.01 g/ml.
A compressed air cylinder stands at 93.0 cm tall and has internal diameter 20.7cm. At room temperature, its pressure is 172 atm. how many moles of air are in the cylinder
It is found that 4.68e-06 g of Nd2(CO3)3 dissolves per 100 mL of aqueous solution at 25 oC. Calculate the solubility-product constant for Nd2(CO3)3.
Suppose you have a spherical balloon filled with air at room teperature and 1.0 atm pressure; its raidus is 12cm. what's the balloon's new radius
The enthalpy of combustion of benzoic acid (C6H5COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be 3226.7 kj?mol
At a certain temperature* (probably not 25 ºC), the solubility of silver sulfate, Ag2SO4, is 0.023 mol/L. Calculate its solubility product constant for this temperature.
Which value is colosest to the POH of a 0.3 M solution of the weak base methylamine (CH3NH2)? the Ka for the acid form of methylamine is 2.27e-11 answer choices are 0.011, 1.94,3.92,10.08 and 12.06.
When a reddish-brown bromine solution (the solvent is often carbon tetrachloride) is added to the alkene shown below, the brown color of the bromine solution disappears
Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2(g) and H2O(g) and releases 5.64 x 103 kJ/mol sucrose. What is q (heat chang
If you wanted to make a 3 liter solution of 500 mM formic acid buffer at ph 3.9 how many grams each of sodium formate (MW=68g/mol) and formic acid (MW=46g/mol) would you add... 98.6 g sodium formate
A massless, rigid board is placed across two bathroom scales that are separated by a distance of 2.06 m. Locate the center of gravity of the person relative to the scale beneath his head
7.03 g of phosphorus reacts with bromine to form 61.39g of phosphorus tribromide, How many grams of bromine reacted in this reaction
what is the main difference between, 2s or 3s or 4s orbitals, or 2p, 3p or 4p. is it just that they are bigger
If you wanted to make a 3 liter solution of 500 mM formic acid buffer at pH 3.9 how many grams each of sodium formate (MW=68g/mol) and formic acid (MW=46g/mol) would you add
This solution is then analyzed for nitrate ion by adding iron (II) sulfate solution and more sulfuric acid, heating the test tube and its contents. The nitrate ion reaction is positive.
A coating is applied to a lens to minimize reflections. what wavelength is minimally reflected for normal incidence in the lowest order
Calculate the cell potential for the following reaction as written at 61 °C, given that [Cr2 ] = 0.826 M and [Ni2 ] = 0.0200 M. Cr(s) + Ni ^2+ (aq) --> Cr^2+ (aq) + Ni(s)
A galvanic (voltaic) cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of copper in a 1.0 M copper(I) ion solution, connected by a sa
A Young's double-slit interference experiment is performed with blue-green argon laser light. The separation between the slits is 0.525 mm, What is the wavelength of argon laser light