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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?
A car of mass 1203 kg collides head-on with a parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic. what is the initial speed of the car
The gas and the liquid have specific heats of 117.2 J/mol K and 72.3 J/mol K. How much heat is evolved when 20.0 g of CCl2F2 is cooled from +40 C to -40 C?
What is the molar mass of a nonpolar molecular compound if 5.52 grams dissolved in 36.0 grams of benzene begins to freeze at -1.87 °C? The freezing point of pure benzene is 5.50 °C and the f
A uniform 3.15-kg rope 25.6 m long lies on the ground at the top of a vertical cliff. What was the change in potential energy of the rope during this maneuver
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.
the product gases from this rxn are then mixed with the remaining two-thirds of the feed stream and sent to a reactor in which the following reaction goes to completion: 2H2S+SO2 goes to 2H2O+3S
Explain why most multicellular organisms use an iron-containing protein for oxygen binding rather than free iron. Your answer should include an explanation of (a) the role of heme and (b) the role o
The radioisotope iodine-131, used to image the thyroid, has a half-life of 8.0 days What fraction of iodine-131 remains in the body after 3.0 days?
A planet can have an atmosphere if the escape speed of the planet is 6 times larger than the thermal speed of molecules in the atmosphere. What is the radius of this object's orbit around the sun
A mass of 0.750 g calcium chloride is diluted with 975 g H2O. What is the chloride ion concentration (in ppm)?
Consider the compounds water, ethylamine, acetone, and aniline, whose Kb values can be found here. Classify them by whether they can be appreciably (Keq>1) protonated by: pyridinium, CH3OH2 , bot
An object with a mass of m = 5.3 kg is attached to the free end of a light string wrapped around a reel of radius R = 0.255 m and mass of M = 3.00 kg, Determine the speed with which the object hits
Calculate the Ka value of a 0.2 M solution of the monoprotic acid, propionic acid, CH3CH2CO2H. The measured pH is 2.44.
A high-energy pulsed laser emits a 1.0-ns-longpulse of average power 1.7×1011W . The beam is nearly a cylinder 2.5×10?3m in radius and it travels in free space. Determine the energy deli
Calculate and record the following for the experiment performed with 20g KClO. mass of the crucible with manganese(IV) dioxide (in grams): 54.200g
In a ballistics test, a 25.0g bullet traveling horizontally at 1200m/s goes through a 40.0cm -thick 350kg stationary target, What average force does the bullet exert on the target
In the following compound [CoCl(NH3)4(H2O)]SO4, write the formula and charge(if applicable) for: a) the ligands b) the complex c) the coordination sphere
A horse is pulling a buggy. the total force by the horse is 475N applied horizontally. What is the force of friction on the driver and buggy
A piece of dry ice (solid carbon dioxide) with a mass of 31.5 g is allowed to sublime (convert from solid to gas) into a large balloon.
A 30.0g ball of clay traveling east at 1.00m/scollides and sticks together with a 30.0g ball of clay traveling north at 6.00m/s
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 transformer is to be used to provide power for a computer disk drive that needs 5.8 V (rms) instead of the 120 V (rms) from the wall outlet. determine the current in the primary
Classify the substances CaCl2, CuSO4, NH3, C2H5OH according to the strongest solute-solvent interaction that will occur between the given substances and water during dissolution from the following c
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating.