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what is the molar solubility of caf2 in 0.10 m naf solution at 25°c? the ksp for caf2 is 1.5 x 10^-10
A buffer is prepared by combining 25 mL of .50 M NH3(aq) with 25 mL of .20 M HCl. What is the pH of the buffer? (Ka(NH4^+)=5.6 x 10^-10)
The vapor pressure of water at 20°C is 17.5 mmHg. What is the vapor pressure of water over a solution prepared from 2.00 × 102 g of sucrose (C12H22O11, molar mass = 342 g/mol) and 3.50 &ti
what is the solubility of O2 at an elevation of 12,000 ft where the atmospheric pressure is 0.657 atm? Assume the temperature is 25°C, and that the mole fraction of O2 in air is 0.209 at both 12
a student placed in an unknown sample plate thin layer chromatography and develops in dichloromethane as solvent. only there is a spot whose Rf is 0.95. This indicates that the unknown material is a
Lead nitrate, Pb(NO3)2, reacts with sodium sulfate, Na2SO4, to make lead sulfate, PbSO4, and sodium nitrate, NaNO3. How much lead sulfate can one make from 65.05 g lead nitrate and 55.02 g sodium su
The fluorocarbon C2Cl3F3 has a normal boiling point of 47.6°C. The specific heats of and C2Cl3F3(g) are 0.91 J/gK and 0.67 J/gK, respectively. The heat of vaporization of the compound is 27.49 k
The potential energy associated with being a given height above the Earth%u2019s surface is mgh. Using this definition of potential energy, determine the ratio for the pressure at height h (Ph) to t
The half-cell is a chamber in the voltaic cell where one half-cell is the site of an oxidation reaction and the other half-cell is the site of a reduction reaction.
Calculate the minimum mass of Pu-238 (in kilograms) that would had to have been loaded on the spacecraft at the time of its launch from earth.
How much energy is released when 32.4 g of water freezes? The heat of fusion for water is 6.02 kJ/mol. q=? kJ
Why does it not make sense to think of sand as just being composed of a bunch of SiO2 molecules
with a solution in them connected by a liquid salt bridge junction filled with KNO3. In one solution you have a graphite electrode that is connected with a wire to a copper electrode in the second s
What is the heat change per mole of CaCl2 dissolved in water? Assume that all the heat is absorbed by the water. (c = 4.18 J/g C)
The final temperature of the water and the carbon is 59.02 C. Calculate the specific heat of carbon. The specific heat of water is 4.18 J/g C.
To what volume should you dilute 150 mL of an 8.00 M CuCl_2 solution so that 55.0 mL of the diluted solution contains 5.9 g CuCl_2
Hydrochloric acid (HCl) reacts with sodium carbonate (Na_2CO_3), forming sodium chloride (NaCl), water (H_2O), and carbon dioxide (CO_2). This equation is balanced as written
Draw a reasonable Lewis structure for POCl3. Assign formal charges for the atoms in your Lewis structure. Draw a second legitimate resonance contributor for POCl3
What mass of chromium could be deposited by electrolysis of an aqueous solution of Cr2(SO4)3 for 155 min using a constant current of 15.0 A? (F = 96485 C/mol)
Titanium occurs in the magnetic mineral ilmenite (FeTiO3), which is often found mixed up with sand. The ilmenite can be separated from the sand with magnets. The titanium can then be extracted from
How much energy is released when 32.4 g of water freezes? The heat of fusion for water is 6.02 kJ/mol.
The solubility of solute in a solvent depends on various parameters, such as temperature, pressure, the nature of the solute, and the nature of the solvent. Considering these parameters, identify th
A solution is prepared by dissolving 20.0 g of K2HPO4 and 25.0 g of KH2PO4 in enough water to produce 1.0 L of solution. What is the pH of this buffer
when that precipitate was treated with NH3 it turned black. Based on this what can you say about the ions that may be present or absent in the solution? Can you reach a conclusion about the presence
What is the hybridization of the nitrogen atom in sulfathiazole, and assuming the sulfur atom is sp2 hybridized how many electrons are there in the sulfathiazole ring