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When 0.186g of an organic substance of unknown molar mass is dissolved in 22.01 g of liquid camphor, the freezing point of the mixture is 176.7 C What is the molar mass of the solute?
An uncharged capacitor and a resistor are connected in series to a source of emf. If = 10.0 V, C = 19.0 µF, and R = 100 O, find the following. (a) the time constant of the circuit (b) the maxi
A long straight wire with diameter d = 0.500 mm carries a current of 5.00 A. What is the magnitude of the magnetic field due to that current at a point a) 0.500 mm from the center line of the wire b
A man drags a 141 lb crate across a floor by pulling on a rope inclined at 21.0 degrees with the horizontal. If the coefficient of static friction is 0.520, and the coefficient of kinetic friction i
Dana has a sports medal suspended by a long ribbon from her rearview mirror. As she accelerates onto the highway, she notices that the medal is hanging at an angle of 15 degrees from the vertical.
Why is it important to use a large excess of sodium borohydride when doing a reduction in aqueous ethanol ? ( hint consider what reaction might occur between water and sodium borohydrid
A cyclotron with a magnetic field of 1.2 T is used to accelerate protons how long does it take for the protons to make one complete trip around the cyclotron at a radius of 25 centimeters?
One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponet is watching the first one, a second snowball is thrown at a low angle timed to arrive be
A hollow sphere of radius 0.35 m, with rotational inertia I = 0.082 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at 36° to the horizontal. At a cert
When concentrated H2SO4(l) is added to KI(aq), I2(s) andH2S(g) are formed. When the equation for this reaction is balanced, what is the number of electrons transferred?
The moon rotates on its axis with the same period that it orbits the Earth. That's why we always see the same side. Find the altitude above the Moon's surface of a lunasynchronous satellite.?
A nonconducting solid sphere of radius 11.9 cm has a uniform volume charge density. The magnitude of the electric field at 23.8 cm from the sphere's center is 1.61 x 103 N/C. (a) What is the sphere'
How much energery is needed to raise the temperature of a silver necklace chain with a mass of 22.5g for room temperature, 25degrees C, to body temperature, 37 degrees C?
Released from rest at the same height, a can of frozen juice rolls to the bottom of the same hill. What is the translational speed of the frozen juice can when it reaches the bottom?
A 79.9 cm ^3 sample of oxygen is collected by water displacement at 24 degrees C. What volume would the gas occupy at standard pressure if the gas is collected originally at a pressure of 98.5
Once the chromatographic column has been prepared , why is it important to allow the level of the liquid in the column to drop to the level of the alumina before applying the solution of the compoun
At 298K, S2F4(g) partially decomposes to SF2 (g). at equilibirum the partial pressure of SF2(g) is 8.4x10-2torr and the partial pressure of S2F4(g) is 36.8 torr.
Combustion of 3.50g of ethanol, C2H5OH (l) ina calorimeter with a heat capacity of 15.2kJ/°C causes a temperature increase from 19.88°C to 26.18°C. Find the molar enthalpy of combustion
Chloromethane, CH3Cl, arises from the oceans and from microbial fermentation and is found throughout the environment. Itis used in the manufacture of various chemicals and has been usedas a topical
(a) What is the impedance of the circuit? (b) What is the phase angle for this circuit? (c) What is the average power supplied to the circuit?
Benzoic acid is a white, crystalline powder used as a food preservative. It consists of carbon, hydrogen, and oxygen. If 0.0500 grams of the compound are burned in excess O2 ,0.126 grams CO2&nb
A 24 hour urine specimen was diluted to 2L \after the solution was buffered to pH10 a 10 ml aliquot was titrated with 27.32 ml of0.003969M EDTA The Calcium in the second aliquot was isolated asCaC2O
A saturated solution of potassium chlorate is dissolved in 100 gof water. If the saturated solution is cooled from90°C to 60°C, how many grams of precipitate will be formed?explain.
A 1.4 wood block is pulled along a wood floor at a steady speed. A second wood block, with mass 2.9 , is attached to the first by a horizontal string. What is the magnitude of the force pulling on t
A solution containing Pt4+ is electrolyzed with acurrent of 3.60 A. How many minutes will it take to plate out 89.0 percent of the platinum in 0.550 L of a 0.0150 M solution of Pt4+?