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An organic substance has an enthalpy of vaporization of 29.0 kJ/mol. The compound has a vapor pressure of 524 mm Hg at 25 °C. At what temperature is the vapor pressure equal to 115 mm Hg?
The plates each have an area of 2 × 10-3 m2, and the spacing between the plates is 6 × 10-3 m. There is no dielectric between the plates. Calculate the energy stored in the capacitor.
If your air conditioner is more than several years old, it may use the chloroflurocarbon CCl2F2 as the heat transfer fluid. The normal boiling point of CCl2F2 is -29.8 C and the enthalpy of vaporiza
When the bus moves with constant velocity, the passenger observes that the falling raindrops are now making an angle of 20 with respect to the vertical.What is the ratio of the speed of the raindrop
The heat of formation of KCl(s) is -436.7 kJ/mol and the heat of formation of KCl(aq, 1 m) is -419.5 kJ/mol. Determine the heat of solution of KCl.
Now a conductor is inserted into the capacitor. The thickness of the conductor is 1/3 the distance between the plates of the capacitor and is centered inbetween the plates of the capacitor. What is
The vapor pressure of pure water at 50.0 °C is 92.5 mm Hg. Calculate the ideal partial pressure of water at this temperature for a mixture of 45.0 g H2O and 55.0 g CH3OH?
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose that a can contains a residual amount of gas at a pressure of 765 mmHg and
(A) Show that the position of a particle on a circle of radius R with center at the origin (x=0,y=0) is given in unit vectors by r=cosθi+sinθj, where θ is the angle of the position
A vector C1 has a magnitude of 40.0 units and points 35.0° above the positive x axis. A second vector C2 has a magnitude of 65.0 units and points in the negative x direction. Use the component m
In a race, John runs 1.00 mile in 4.02 min, mounts a bicycle, and rides back to his starting point, which is also the finish line, in 3.02 min. What is the magnitude of John's average velocity for t
How many hydrogen bonds exist per full turn of the alpha helix? What is the rise in angstrom? Can these be different in different alpha helices? Explain.
(a) If the current #1 through the bottom loop is increasing with time, what is the direction of the induced current in the top loop? (b) If the current #2 through the top loop is decreasing with tim
The geometric angle BETWEEN the two bonds that connect an alpha-carbon to its nearest neighbors on the polypeptide backbone is approximately 109 degrees. Explain. What is polypeptide backbone?
Calculate the temperature of the air inside the balloon which will produce the required lift. Assume thatthe outside air temperature is 0*C and that air is an ideal gasunder these conditions. What f
Find the direction of the average force on the ball. (in degrees from the initial direction of motion of the ball)
A chemical reaction is found to have an activation energy (Ea = 15 kJ/mol). At a temperature of 505 K, what fraction of collisions have enough energy to exceed the activation energy?
(a) If the radius of the Gaussian surface were doubled, how much flux would pass through the surface? (b) What is the value of the point charge in coulombs?
When a 0.6333-g sample of a compound of carbon, hydrogen and sulfur was burned in excess oxygen, 0.9272 g CO2, 0.3795 g H2O and 0.6749 g SO2 were obtained.
Two positive point charges, each 16 uC (micro Coulombs), lie along the x-axis at x = -0.12m and x = +0.12m. Find the electric field at the point (0, 0.20 m) on the y-axis.
A butterfly net is in a uniform electric field of magnitude E = 4.6 mN/C. The rim, a circle of radius a = 6.5 cm, is aligned perpendicular to the field. The net contains no net charge. Find the elec
A 6.0 g sample of [Cu(H2O)4]SO4xH2O (molar mass = 249.68 g/mol) is dissolved in deionized water. If an excess of ammonia is added to the solution, solid [Cu(NH3)4]SO4xH20 (molar mass = 245.61 g/mol)
The pH difference across the membrane of a glass electrode is 6.45. How much voltage is generated by the pH gradient at:25degreesC and 40 degreesC? with steps.
How long does it take from the moment when the motorcycle starts to accelerate until it catches up with the car? In other words, find t2-t1.
Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products.