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When 2.45 g of an unknown weak acid (HA) with a molar mass of 85.0 g/mol is dissolved in 250.0 g of water, the freezing point of the resulting solution is -0.255 C. Calculate Ka for the unknown wea
When metabolized, an orange provides 445 kJ of energy. What mass of water could this amount of energy raise from 25.0 degrees calcius to the boiling point?
1. How could you separate barium sulfate, BaSO4, from (NH4)2CO3? 2. How could you separate zinc chloride, ZnCl2, from zinc sulfide,ZnS?
Calculate the pH of the final solution. A solution is made by dissolving 25.6 g of NaOH in approximately 450 mL of water in a volumetric flask. The solution becomes quite warm, but after it is allo
A 27.0 g sample of an unknown carbon-hydrogen compound was burned in excess oxygen to form 88.0 g of CO2. What is a possible molecular formula of the hydrocarbon?
A solution containing 3.47mM X (analyte) and 1.72 mM S (standard) gave peak areas of 3473 and 10222, respectively, in a chromatographic analysis. Then 1.00ml of 8.47mM S was added to 5.00ml of unkn
If the height of the mercury column in the leveling bulb is 30mm greater than that in the gas buret and the atmospheric pressure is 670 mm, what is the pressure on the gas trapped in the buret?
The rate of a first order reaction is 4.6 x 10 to the -4 power at 638K. If the activation energy is 104 kj/mol, calculate the temperature in K at which the rate constant is 8.80 x 10 to the -4 power
p-dichlorobenzene (designated B) gave the relative detector response (peak area of A)/(peak area of B) = 0.71 in a chromatography experiment. A solution containing an unknown quantity of A plus 930
A calorimeter consists of metal parts with a heat capacity of 850.0 J K-1 and 1100 g of oil with a specific heat of 2.184 J g-1 K-1. What is the heat capacity of the entire assembly?
A 0.050M solution of glycerine, C3H8)3, and a 0.050M solution of lycine, C5H11NO2, are prepared. Which solution contains the most dissolved molecules per litre?
How does the strngth of the attraction between water molecules and sodium and chloride ions compare with the strength of the attraction between the sodium ions and chloride ions? How do you know?
The GPR (Ground Penetrating Radar) produced an electromagnetic radiation that had a frequency of 2.00 X 102 MHz. Determine the amount of energy (Kj) in this radiation.
Determine the values of q, w, ?U, ?H, ?S, ?Stot and ?G for each stage of the cycle and for the cycle as a whole. Express your answer as a table of values.
A mixture is prepared by mixing a 0.10 L solution of 0.12 M NaCl with a 0.23 solution of 0.18 M MgCl2. What volume of a 0.20 M silver nitrate solution is required to precipitate all the Cl ions in
How many moles of sodium hypobromite, NaBrO, should be added to 1.00L of 0.050M hypobromous acid, HBrO, to form a buffer solution of pH 8.80?
The original conditions on a container filled with gas at a constant temperature are 180 cc and 300 mm Hg. The desired new volume is 90 cc.
According to the following reaction, how many moles of nitrogen gas will be formed upon the complete reaction of 0.646 moles nitrogen monoxide with excess hydrogen gas?
An unknown sample of N2+ gave a current of 2.36µA in an electrochemical analysis. When 0.500 mL of solution containing 0.0287M N2+ was added to 25.0 mL of unknown, the current increased to 3.7
A graduated cylinder contains 138 of water. A 12.0 piece of iron (density = 7.86 ) and a 22.0 piece of lead are added. What is the new water level in the cylinder?
A metal container holding xenon gas (Xe) has a pressure of 458 torr at 20 degrees celcius. At what temperature will the pressure be 1.00atm?
determine the total number of moles of oxygen that react completely with 8.0 moles of C2H6.
A solution is made by dissolving 26.42g of (NH4)2SO4 in enough H2O to make 50.00mL of solution. What is the molar mass of (NH4)2SO4?