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You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00 * 10-4). A buffer of pH 3.00 is needed. What volumes of HNO2 and KNO2 are required to make 1 liter of buffered solution?
What combination of properties is responsible for the selection of trinitrotoluene as a military explosive
At 9.°C and 1.40 atm pressure, a sample of helium gas occupies a volume of 5.10 L. The sample is compressed and heated to 60.°C. Calculate the final pressure of the sample, if the final volu
find the the difference in electric potential between the location electrode and at a distance of 5.0nm from electrode.
What is the molality of ethanol in a solution made by dissolving 14.6 g of ethanol, C2H5OH, in 53.6 g of water?
What is the molarity of a solution prepared by dissolving 4.92 g of calcium nitrate, Ca(NO3)2, in 250 mL of water? (The molar mass of Ca(NO3)2 is 164 g/mol.)
The density of solid sodium chloride, NaCl, is 2.17g/cm3. Use your knowledge of the sodium chloride lattice to calculate the spacing between Na+ and Cl- nearest neighbors, in cm. (Atomic masses (am
What mass of F2 is needed to produce 167 g of PF3 if the reaction has a 77.0% yield?
Using appropriate equilibrium constants, calculate the pH of the solution: 0.060M in potassium propionate, KC2H5O2, and 0.085M in propionic acid, HC3H5O2
Explain why a stable Grignard reagent cannot be created using an alkyl halide species that contains either a protic group (amino, hydroxyl, thiol, carboxylic acid) or an electrophilic carbonyl func
A 385-L sample of this gas, measured at 23 C and 729mmHg , is burned in an excess of oxygen gas. How much heat, in kJ, is evolved from this combustion reaction?
If a student used an iron scoopula, instead of a plastic one, to add unknown metal to the HCl solution, will it affect the calculated molar mass of the unknown metal?
Calculate the theoretical mass of magnesium oxide that could form by heating 1.75 g of magnesium metal in an excess of oxygen?
Calculate the total volume of gas (at 135 and 747 ) produced by the complete decomposition of 1.35 of ammonium nitrate
What is the structure of a compound of molecular formula C10H14O2 that shows a strong IR absorption at 3150-2850 cm-1 and gives the following 1H NMR absorptions: 1.4 (triplet, 6H), 4.0 (quartet, 4H
Calculate the Delta H for this reaction using standard enthalpies formation.
What is the percent yield of a reaction in which 212 g phosphorus trichloride reacts with excess water to form 109 g HCl and aqueous phosphorus acid (H3PO3)?
Fat tissue is 85% fat and 15% water. The complete breakdown of the fat itself converts it to Co2 and H2O, which releases 9.0kcal per gram of the fat in the tissue.
Calculate the concentration of ions in a 0.010 aqueous solution of sulfuric acid.
In every electrolyctic and galvanic (voltaic) cell the anode is that electrode: a) at which oxidation occurs. b) which attracts cations
Calculate the grams of formic acid and sodium formate necessary to make 500 mL of a biffer that has a formic acid concentration of .75M and a sodium formate concentration of .75M.
Calculate change of boiling temperature of pure liquid (say water) with change of atmospheric pressure ? (Pchem)
starting with only the solid, it is found that 40 degrees Celsius the total gas pressure (NH3 and CO2) is 0.363 atm. Calculate the partial pressure of NH3 and CO2.
A refrigeration tank holding 5.00L Freon gas (C2Cl2F4) at 25°C. and 3.00 atm pressure developed a leak. When the leak was discovered and repaired, the tank had lost 76.0g of the gas. What was th
A first order reaction has an activation energy of 65.7 kJ/mol and a frequency factor (Arrhenius constant) of 2.36 x 1013 sec -1. Calculate the rate constant at 18 oC.