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A tank of volume 1.0 m^3 contains 7.3 moles of nitrogen, 5.2 moles of oxygen, 1.5 moles of helium, and 8.1 moles of carbon dioxide at -75 degrees C. Calculate the partial pressure of each gas in the
Suppose an integral membrane protein diffuses in a cell membrane at a rate of 1.04 square centimeters per 0.09 seconds. Express this rate as an integer with the correct number of significant figur
A mixture of ideal gases having a total mass of 16 g is placed in a 13 L vessel at 270.0 K. The equilibrium pressure is measured to be 2.5 bar. Calculate the average molar mass of the gas mixture.
Which compound would have the lowest boiling point?
How many grams of benzoic acid (C6H5COOH) are contained in a 75 mL solution at 0.24 M concentration?
If a temperature increase from 12.0 to 22.0 doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction?
Calculate the free energy difference (?G) at 37oC due to an glucose gradient across the membrane of a phospholipid vesicle. The arginine is moving from an area with a concentration of glucose equal
What concentration of O2 (in grams per liter) can dissolve in water at 37 degrees C when the O2 partial pressure is 40 mm Hg? The Henrys law constant for O2 at 37 degrees C is 1.5x1o^-6 mol/(L-mmH
Distillation is frequently used to isolate the nonvolatile organic solute from a solution containing an organic solvent. Explain how this would be accomplished using a simple distillation.
Magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas. An excess of magnesium is reacted with 20.0 mL of 3.00M and all of the hydrogen is collected in a b
Calculate delta H for the reaction: 2N2O3(g) --> N2O4(g) + 2NO(g)
The alpha-particle bombardment of fluorine-19 generates sodium-22 and neutrons. Write the nuclear equation, including the intermediate compounds.
Calculate the pH of a mixture containing 50 mL of 0.1M NaH2PO4 and 150 mL of 0.1M Na2HPO4. How many mL of 0.1M H3PO4 should be added to the above buffer to lower the pH by one unit?
Interstellar space can be considered as having 10 molecules of hydrogen per cubic centimeter and an average temperature of 2.7 K. Determine the pressure of hydrogen in interstellar space.
Which compound will exhibit the greatest dipole moment?
Determine the equilibrium concentration of carbon monoxide if 0.80 mol of H2 and 0.80 mol of CO2 are injected into a 5.0 liter flask and heated to 1650°C.
How many moles of solid NaF would have to be added to 1.0 L of 1.90 M HF solution to achieve a buffer of pH = 3.35, assume there is no volume change. (Ka for HF = 7.2 x 10-4).
A 3.12 g sample of solute is dissolved in 35.0 g of water. The freezing point of this solution is found to be -1.23°C. What is the molar mass of the solute? For water, Kf = 1.86 degkg/mol.
If 0.11 g of H2O2 decomposes in a 2.50 L flask at 25 degrees Celcius, what is the pressure of O2 and H2O?
A 0.100 molal solution of a non-electrolute in water raises the boiling point of the resulting solution by 0.052 degrees. What will be the boiling point of a 0.100 molal solution of Na3PO4?
What is the relationship between vapor pressure, atmospheric pressure, and the boiling point of a liquid?
What is the magnitude and sign of the molar heat of vaporization of butane? Explain using Hess's law. Is your sign for the heat of vaporization realistic? Explain.
A chemical reaction takes place in a container of cross-sectional area 100 cm^2. As a result of the reaction, a priston is pushed out through 10 cm against external pressure of 1.0 atm. Calculate t
The molar heat of fusion of aluminum metal is 10.79 kJ/mol, whereas its heat of vaporization is 293.4 kJ/mol. What quantity of heat would be required to vaporize 1.52 g of aluminum at its normal boili
Calculate the work done when the gas expands isothermically against a constant external pressure of 210 Torr until it's volume has increased by 3.5L, then calculate the work done if the expansion