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At 1500 degrees C the equilibrium constant for the reaction CO(g)+2H2(g) --><--CH3OH(g) has the value Kp=1.4x10^-7. Calculate delta G for this reaction at 1500 degrees C.
A sample of an unknown gas effuses in 12.4 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.59 min. What is the molar mass of the unknown gas?
Calculate the quantity of water each student was required to use and the maximum recovery of benzoic acid possible in each case.
How many grams if lead (II) iodide are formed? ( molar mass: pb(no3)2= 331 g;KI 166g; pbI2 =467 g; kno = 101 g.
Aspirin has a pH of 3. Some pepole who take large amounts of aspirin (for example, for arthritis) take a pill that combines with Maalox. What's the purpose of the combination?
An aqueous solution has a vapor pressure of 83.7 at 50 . The vapor pressure of pure water at this temperature is 92.6 . What is the concentration of in mass percent?
If the solubility of a particular solute is 10g/100g H20 at 20 degrees C, which of the following solution concentrations would represent a supersaturated aquenous solution of that solute?
Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane
A saturated solution of lead iodate in pure water has a lead ion concentration of 4.0 x 10¯5 mole per liter at 25 °C. Calculate the value for the solubility-product constant of Pb(IO3)2 at 25
You wish to make a 0.294 M perchloric acid solution from a stock solution of 6.00 M perchloric acid. How much concentrated acid must you add to obtain a total volume of 150 mL of the dilute solution
Calculate the number of H3O+(aq) ions in a typical cell with an intracellular pH of 6.4. A typical cell has a volume of 1.6 x 10-12 cm3 and contains about 80% water by volume.
How many atoms of carbon are there in 0.39 mol of procaine, C13H20N2O2, a "pain killer" used by dentists?
10.7 mL of a 0.049 mol/L EDTA solution is required to titrate a sample to the equivalence point. How many moles of divalent metal cations were in your sample?
The gravimetric analysis of this experiment is meant to be quantitative; therefore, all precautions should be made to minimize errors in the analysis. The crucible and lid are handled exclusively wi
A mixture of NO(g) at a partial pressure of 1.50 atm and NO2(g) at a partial pressure of 0.50 atm is allowed to come to equilibrium in a sealed container maintained at 20 C. What is the total pressu
The fizz of Alka seltzer dissolving in water is due to the following reactions. 3NaHCO3((aq) + H3C6H5O7(aq) --> 3CO2 (g) + 3H2O(l) + Na3C6H5O7(aq). If you begin with 2 grams of each reactant whic
The first step in balancing would be to write a preliminary, unbalanced equation with the correct chemical formulas. Which of the following is the correct form?
Calculate the rate at which sulfur dioxide is being produced. Give your answer in kilograms per second. Round your answer to 2 significant digits.
At 427 °C the value of Kp for the equilibrium represented by the balanced equation is 5.88 x 10-4. Calculate the value of Kc at the same temperature. Express answer in scientific notation.
Hydrogen gas was collected over water in a eudiometer at 26 degrees c when the atmospheric pressure was 726 mm hg. What was the pressure of the hydrogen gas?
When 17 mL of a solution containing .29 M Ca(OH)2 is diluted to 30 mL, a dilute solution is formed. What is the OH- concentration in 5 mL of the dilute solution?
A sample of 1.012 g of KHP (Potassium Hydrogen Phthalate, molar mass = 204.22g/mol) was dissolved in ~ 25 mL distilled water and titrated with a NaOH solution of unknown concentration. If 28.98 mL o
A 125 g aluminum block at an initial temperature of 95°C is dropped into a styrofoam flask containing 150 mL of water at 20°C. What is the final temperature? Specific heat of aluminum is 0.9
What is the change in internal energy (in J) of a system that absorbs 0.588 kJ of heat from its surroundings and has 0.219 kcal of work done on it?
The internal energy change is 3.74 kJ when an ideal gas expands from 3.50 to 22.6 liters at a constant external pressure of 3.04 atm. What is the heat absorbed by the gas from its surroundings?