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The SI unit of length is the meter, which is defined as thelength equal to 1,650,763.73 wavelengths of the light emmitted by aparticular energy transition in krypton atoms. Calculate thefrequency o
A 2.10-g sample of PCl3(l) reacted with excess H2O(l) in acalorimeter. The temerature rose from 20.55oC to30.30oC. The heat capcity of the calorimeter andcontents is 427 J/oC. What is the enthalpy c
Where did the Energy values come from? How did you know what values to use so you could calculate the change in energy?
Three commin lab experiments are shown. In each case, describehow the IR spectrum of the product would differ from that of thereactant. Give approximate frequencies for distinctive peaks in theIR sp
Calculate the theoretical yield of isopentyl acetate that canbe made from 20.0g isopentyl alcohol and 25.0g acetic acid
For which blocks of elements are outer electrons the same asvalence electrons? For which are d electrons oftenincluded among valence electrons?
Zinc citrate, Zn3(C6H5O7)2,is an ingredient in toothpaste. It is synthesized by the reactionof zinc carbonate with citric acid. 3ZnCO3(s) + 2C6H8O7(aq) → Zn3(C6H5O7)2(aq) + 3H2O(l) +3CO2(g)
Why is it preferable to "use nuclear binding energy per nucleon for a comparison of the stabilities of different nuclei?
Methabe reacts withoxygen in the air to produce carbon dioxide and water. ammoniareacts with oxygen in the air to produce nitrogen monoxide andwater.
SCl2 state the molecular polarity in a 3d sketch of youmolecule and lable the dipole moment of each bond, state weatherpolar or non polar what are the bond angles of SCl2.
How many moles of Na+ ions are there in 1 mole ofNa2SO4 ? Do you simply have to divide the Relative Atomic Mass of Na bythe Relative atomic mass of Na2SO4 ? This would give the answer of 0.16?
The amount of heat released when 20 grams of water cools from 30 degrees celsius to 20 degrees celsius is how many calories.
Dry air had a CO2 mole fraction of 0.00038 in 2007 (compared with 0.00032 in 1965). Calculate the total mass of CO2 that strikes 1 cm^2 of one side of a green leaf in 1 s in dry air at 25oC and 1.0
A throttling valve has inlet conditions of saturated vapor R-134a at 600 kPa exits at 240 kPa. The kinetic energy in the inlet and exit flows is the same. What is the exit temperature?
The work input to the control volume is 240 kJ per kg of air flowing.determine the heat transfer rate, in kW. Evaluate the properties of air using variable specific heats.
Determine the average heat transfer per unit width, assuming that the critical Reynolds number, Rec = 500,000. Repeat the analysis for liquid ammonia.
The second engine receives this energy rejected by the first one, converts some of the work, and rejects the rest to a reservoir at 300 K. If the thermal efficiency of both engines is the same what
Air enters the compressor at 98 kPa and 295 K at a rate of 10 kg/s and exits at 1 MPa and 620 K. Determine the excess power produced by the generator that can be used for other purposes.
Consider a Carnot Refrigeration cycle with a working fluid of R-134a operating between temperatures of -10oC and 20oC. What is the maximum coefficient of performance?
The density of water is constant at 1000 kg/m3 what must the temperature of stream B be such that the temperature of the well-mixed result will be 60oC when the tank fills.
Write the exit volume flow rate as a function of the volume flow rates at states 1 and 2, the heat transfer rate, P3, and k=Cp/Cv.
Determine (A) the mass flow rate through the nozzle, (B) the exit temperature of the air, and (C) the exit area of the nozzle. Assume constant specific heats at 300 K.
If the heat lost to the surroundings amounts to 10% of the power output, determine (A) the change in kinetic energy, (B) the power output, and (C) the turbine inlet area.
The power supplied to the compressor is 2.5 kW. Determine the volume flow rate of the refrigerant at both the inlet and exit to the compressor, in m3/min.
Calculate the proper diameter to prevent air entrainment. Is the calculated diameter realistic? If yes explain if no say why and suggest a proper solution.