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A 2 L jar, equipped with a tight-fitting lid that contains a rubber septum, is half filled with water. At equilibrium, the air space has a volume of 1 L, a total pressure of 1 atm, and a temperature of 298 K. The i mg of formaldehyde (HCHO, MW = 30 g/mol) is injected through the septum into the water. Some of the formaldehyde escapes into the gas phase. Consider the situation when a new equilibrium is established. Determine
(a) the equilibrium mass concentration of HCHO in water and
(b) the equilibrium mole fraction of HCHO in air
The wood specimen is to be loaded in a testing machine until it fails in tension. The ultimate normal strength of the wood is ?ult = 1800 psi and the ultimate shear strength of the wood is ult = 800 psi.
A round steel alloy bar with a diameter of 0.75 in and a gauge length of 3.0 in was subjected to tension, with the results shown in the accompanying table. using a computer spread sheet program, plot the stress-strain relationship. from the graph, de..
determine the stations and elevations of the PVCs, PVIs and PVTs of the two vertical curves required to connect the highway segments, as well as the length of the constant grade section (connecting grade is to be small as possible).
A signal approach has 20 seconds of displayed green, 4 seconds of yellow, and 3 seconds of all red (assume typical start-up, lost time, and clearance time). The cycle length is 60 seconds.
In a certain community 36% of the families own a dog, and 22 percent of the families that own a dog also own a cat. In addition 30 percent of the families own a cat. a.) what percentage of families own both a dog and a cat
Average flow rate = .0022 m^3 /s (190 m^3 /d) Influent Substrate concentration = 250 mg/L as COD (all essentially soluble) Mean cell residence time is to be 5 days Volume of mix tank
An unknown fluid flows through a horizontal 35-mm-diameter pipe with a Reynolds number of 100,000 and a density of 680 kg/m3. The pressure drop across a 21-mm-diameter nozzle meter placed in the pipe is 4.2 kPa.
A project involves transporting iron pipe to a jobsite that is 43 miles from the supplier. The pipe will be hauled in trucks that can carry 16 pipes per load. Each pipe is 20 ft in length. The average haul speed of a truck will be 50 mi./hr and re..
The velocity of the center point of the wheel is constant at 20 ft/sec to the right. For the instant, determine the following: a) The velocity and acceleration of point B (which is attached to the wheel) measured with respect to ground.
ferryboat queuing lane holds 40 vehicles. If vehicles are processed (tolls collected) at a uniform deterministic rate of 5 vehicles per minute and processing begins when the lane reaches capacity
The linkage shown is made up of two 3-kg rectangular members (0.4 m by 0.1 m), and is flying through the air. At the instant shown, the vertical member has angular velocity 4 rad/s, and the angled member has angular velocity 1 rad/s.
total energy (E) of a projectile is the sum of its kinetic and potential energy: E= 1/2 mV^2 +mgz where m is mass of projectile, V is speed, g is gravitational constant and z is height. 5.0 kg object, dropped from rest (V=0 at time t=0)
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