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Chlorofluorocarbons (CFC's) are organic compounds that have been implicated in ozone depletion. When the CFC known as Freon 12 (CCl2F2) is exposed to UV radiation (wavelength in the range of 10 nm to 400 nm, a bit shorter than visible light), a chlorine atom breaks off from the rest of the molecule. Prove that this is possible by calculating the maximum wavelength (in meters) capable of breaking the C-Cl bond.
Single Bond
H-H 435
F-F 125
CL-CL 242
C-C 347
Multiple bonds
C=C 610
c---c 836
a. What is the melting point at standard conditions for ammonia? Boling point is given -33.4C. b. What is the enthalpy change for boiling ammonia at 0C?
For the conditions of part (a), calculate the heat loss with a 20-mm-thick layer of insulation (k = 0.08 W/m· K). Would the heat loss change significantly with an appreciable wind speed?
Calculate the power transferred across the air gap, the rotor copper loss at full load, and the electromagnetic torque at full load in newton-meters.
Suppose a capacitor is inserted into the circuit instead of any of the resistors and the current is switched on. Draw a closed contour for which the total net current is not necessarily zero.
Two balanced, three-phase, wye-connected loads are in parallel across a balanced three-phase supply. Load 1 draws a current of 20 A at 0.8 power factor leading, and load 2 draws a current of 30 A at 0.8 power factor lagging.
1name the five classes of fire and give an example of each. describe how an extinguishing agent controls each class of
what is the hottest possible temperature that can be tolerated without the introduction of thermal stresses?
Explain why there are doubts incorporate zinc into transition elements mentioned properties of transition elements that are not owned by zinc
It is further reported that 53% of the heat added during the heating step is rejected during the cooling step. What is your evaluation of this process?
Calculate the magnetic vector potential at a distance Q from the center of the wire. Assume for simplicity that the wire extends from -L to +L and that L > > Q.
the dot regulation at 49 cfr 174.450 previously stipulated that when fire occurs in a domestic rail shipment of
determine the standard rate of return on the investment.
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