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A quantity of 0.20 mol of carbon dioxide was heated to a certain temperature with an excess of graphite in a closed container until the following equilibrium was reached: C (s) + CO2 (g) <--> 2CO (g) Under these conditions, the average molar mass of the gas was 35 g/mol. (a) calculate the mole fractions of CO and CO2. (b) what is the value of equilibrium constant Kp if the total pressure is 11 atm?
Calculate the mass of nitrogen dissolved at room temperature in an 83.0 {rm L} home aquarium. Assume a total pressure of 1.0 {rm atm} and a mole fraction for nitrogen of 0.78.
A system absorbs 192 kj of heat and the surroundings do 110 kj of work on the system. what is the change in internal energy of the system.
A 2.9 m solution of methanol (CH3OH) in water has a density of 0.984 g/ml. What are the a) mass percent, b) molarity, and c) mole fraction of methanol in this solution?
Three gases (8.00 g of methane, 18.0 g of ethane, and an unknown amount of propane were added to the same 10.0-L container. At 23.0 degrees C, the total pressure in the container is 4.50 atm. Calculate the partial pressure of each gas in the conta..
What mass of rm NaOH is needed to precipitate the rm Cd^{2+} ions from 35.0 mL of 0.540 M rm Cd(NO_3)_2 solution?
Formic acid (Ka= 1.7 x 10^-4) and sodium formate were used to prepare a buffer solution of pH 4.31. The concentration of the undissociated formic acid in this buffer solution was 0.80 mol/L
A silver electrode is placed in a saturated solution of AgBr. This half-cell is connected to a standard hydrogen electrode and the voltage is found to be +0.437 V. Calculate Ksp for AgBr.
The air in a laboratory was measured with a barometer to be 7.40 x 102 mm Hg. What is the laboratory air pressure in atm?
if the height of the mercury column in the leveling bulb is 20 mm greater than that in the gas buret and the atmospheric pressure is 650 mm, what is the pressure of the gas trapped in the buret?
2500 kg/hr of a mixture containing equal parts by mass of benzene and toluene are distilled. The flow rate of the overhead product stream is 988 kg/hr , and the bottom stream contains 17.03 wt% benzene.
We have noted that water level rises to 62.4mL when a piece of metal of 48 grams is dropped into 50.0mL of H 2 O in a graduated cylinder. Determine the density of this metal?
A 50.0 mL sample of 0.40 M benzoic acid, C6H5COOH, a weak monoprotic acid, is titrated with 0.48 M NaOH. Calculate the pH at the equivalence point. Ka of C6H5COOH = 6.5 10-5
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