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Which of the following combinations would be the best to buffer an aqueous solution at a pH of 5.0? H3PO4 and H2PO4- (Ka=7.5e-3) HNO2 and NO2 (Ka=(4.5e-4) CH3CO2H and CH3COO (Ka= 1.8e-5) H2PO4 and H
for a helium aton in a one-dimensional box calculate the value of the quantum number of energy level for which the energy is equal to 3/2kt at 25 degrees c for a 1nm long box
A stream of air (21% O2 m, the rest N2) flowing at a rate of 10.0 kg/h is to be mixed with a stream of CO2 inside a mixer. The CO2 enters the mixer at a rate of 20.0 m/h at 150 ?C and 1.5 bar. What
An apple is placed 13.6 cm in front of a diverging lens with a focal length of magnitude 22.4 cm. What is the magnification of the image of the apple
The positions of three particles, written as (x, y coordinates, are: particle 1 (mass 3.7 kg) at (4 m, 0 m); What is the location of the center of mass
An ideal gas mixture contains 35% helium, 20% methane, and 45% nitrogen (by volume) at 2.00 atm absolute and 90 C. Calculate: (a) The partial pressure of each component
Two ice skaters, with masses of 30.0kg and 75.0kg , are at the center of a 30.0m -diameter circular rink. how long does the lighter skater take to reach the edge
The pressure gauge on a 20.0 m3 tank of nitrogen at 25 C reads 10 bar. Estimate the mass of nitrogen in the tank by : (a) Direct solution of the ideal gas equation of state. (b) Conversion from stan
A tennis player swings her 1000 g racket with a speed of 15.0m/s . She hits a 60 g tennis ball that was approaching her at a speed of 15.0m/s. compute the average force that the racket exerts on the
Sodium phosphate is added to a solution that contains 0.0014 M aluminum nitrate and 0.078 M calcium chloride. The concentration of the first ion to precipitate (either Al3+ or Ca2+) decreases as its
A 40.0g ball of clay traveling east at 3.00m/s collides, What is the speed of the resulting ball of clay
Calculate the solubility of copper (II) iodate in 0.56 M copper (II) nitrate. Ksp* is 7.4x10-8 M3.
A parallel-plate capacitor having square plates 4.50cm on each side and 8.00mm apart is placed in series with an ac source of angular frequency 620rad/s, What is the resonance angular frequency of t
At a certain temperature, the solubility of cadmium fluoride, CdF2, is 0.162 mol/L. Calculate its solubility product constant for this temperature.
Dan is gliding on his skateboard at 4.00m/s . He suddenly jumps backward off the skateboard, How fast is Dan going as his feet hit the ground
Diphosphorus pentoxide is added to water Hydrogen sulfide gas is bubbled through a solution of silver nitrate.
An RLC series circuit has R=1.35 kOhm, L=225 mH, and C=2.50 uF (micro farads) and is connected across a 60 Hz power supply. find the reactances of the capacitor and inductor
Displays the volume and pH at which equivalence was reached and plots this point on the graph and validates the code by plotting the midpoint using both methods and displaying the volume and pH for bo
At a certain temperature, the solubility of potassium iodate, KIO3, is 41.1 g/L. Calculate its solubility product constant for this temperature.
The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. find the speed of the lighter box
Desalination of brackish water is achieved by evaporation. A fraction of feed water is sent through an evaporator and the other is bypassed. The fraction bypassed and the pure water leaving the evap
High-purity benzoic acid (C6H5COOH; delta H rxn for combustion= -3227 KJ/mol) is used as a standard for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity= 1365 J/
A 15.0 kg block of ice at 0 degrees C falls into Lake Superior, which is a freshwater lake. What is the change in entropy, delta S, of the lake
If two successive overtones of a vibrating string are 420 Hz and 480 Hz, what is the frequency of the first overtone