I kg of air initially at 1 bar and 20°C is work as the cycle shown. If the work net of this cycle is 55.979 kJ, then the temperature at point 3 is. . ..
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- A piston/cylinder setup contains 1 kg of air at 20°C with an initial volume of V1=0.1 m3, as shown in Fig. Q7. Initially, the piston rests on some stops, but it is possible for it to move within the cylinder without friction. To lift the piston and start such motion, an air pressure of 1400 kPa is required. Now, heat is transferred to the system so that the temperature of the air reaches to a final value of 300°C. Fig. Q7 A. Which statement is true? The air can lift the piston before the temperature reaches to 300°C The air cannot lift the piston before the temperature reaches to 300°CThis pV diagram shows two different thermodynamic processes undergoneby 0.40 mol of a monatomic gas (where y equals 1.67). Process A is adiabatic, and process B is shown by a straight line (the process is unknown). What is the TF for both processes? For each one of the processes, what are the changes in thermal energy, the heat transferred, and the work done on the gas?a) A 1.60 dm3 sample of a mixture of methane gas, CH4 and oxygen gas, measured at 25 oC and 101 kPa, was allowed to react in a bomb calorimeter in which, had a heat capacity of 5.30 kJ/K altogether with its contents. The complete combustion of the methane gas to carbon dioxide gas and water caused a temperature rise in the calorimeter of 6.28 K. Given that ∆Ho c (CH4) is -560 kJ/mol. i. Define the standard enthalpy of combustion of methane ii. Write a thermochemical equation for the combustion of methane iii. Knowing the ∆Ho c of methane, calculate the number of mole of methane in the mixture. iv. Calculate the total moles of gases in the calorimeter.
- A sample containing 2.05 moles of an ideal gas with CV = 20.1 J K-1 is initially at 3.84 bar and 300. K. It is compressed at constant volume until its pressure reaches 5.62 bar. Calculate the final temperature, work done, heat transferred, ΔU, ΔH and ΔS for the process.To properly determine the internal energy of combustion methylhydrazine, the calorimeter was first calibrated. A 0.4500 g sample of sucrose (MW 342.296 g/mol)) was ignited under identical conditions and produced a temperature rise of 1.98 K. For sucrose, the internal energy combustion at constant volume, ∆U, is known to be –5616.64 kJ/mol. Calculate the calorimeter constant, in kJ/K.A smelting plant that extracts copper from ore uses a fuel analyzing 25% methanol and 75% 1-propanol to produce heat. This fuel costs $2.7 per liter. In order to reduce costs, the fuel was switch to a 50% methanol and 50% 1-propanol blend which is at $2.2 per liter. Calculate for the %CV loss due to sensible heatb. %CV loss due to unburnt COc. %CV loss due to uncondensed waterd. Thermal efficiency of the combustion
- A piston-cylinder device, with a set of tops on the top, initially contains 5 kg of air at 310 k and 200 KPa. Heat is now transferred to the air, and the piston rises until it hits the stops, at which point the volume is twice the initial volume. More heat is transferred until the pressure inside the cylinder also doubles. a) In state 1: specific volume and specific internal energy b) In state 2: Specific volume c) In state 3: Temperature in K and specific internal energy d) The work carried out during the process e) Heat transferred during the processOne hundred mole NH3/s and 200 mole O2/s at 25 degrees C are fed into a reactor in which the ammonia is completely consumed. The product gas emerges at 300 degreesC. Calculate the rate at which heat must be transferred to or from thereactor, assuming operation at approximately 1 atm. The standard heat ofreaction for the oxidation of ammonia is given below: NH3 (g) + 5O2 (g) → 4NO(g) + 6H2O(v); ΔHr^0= -904.7KJ(ΔHr^0-904.76KJ/s)One mole of nitrogen (N2) is cooled from an initial temperature and pressure of 700 K and 10 bar to a final temperature of 300 K. The heat capacity of nitrogen may be taken as: Cp,m = 28.58 + 3.77 × 10-3 T where Cp,m is in J mol-1 K-1 and T is in Kelvin. Assuming nitrogen behaves as an ideal gas, calculate q, w, ∆U, and ∆H for this process when it is carried out (a) at constant pressure, and (b) at constant volume. Compare the values obtained for the two cases.
- The Carnot heat engine receives 500 kJ of energy from a thermal energy store at 652 ° C and supplies heat to a thermal energy store at 30 ° C. Calculate (a) the thermal efficiency of the Carnot machine, (b) the heat released. low temperature thermal energy storageAs some of you know, I am an aficionado of Starbuck's Steamed Milk, Venti size. Steamed milk is made by passing superheated steam into a stainless steel container containing the milk. Assume that the stcam is at 25C,L-$40 calories/gram, and the specific heat of steam is 0.500 calories/gram/degree C. Also assume that the milk is at 5°C and that 750 ml of milk represent the Venti size. The stainless steel container can be considered to have a mass of 400. grams and a specific heal capacity of 0.600 Jgram/K. If the density of milk is its specific heat is 4.184 Vgram/K, how many grams of steam does it take to raise the milk's temperature to a comfortable 65 C? Thank you for your help!Find ΔS for the system, surroundings, and universe when 28.2 g of liquid H2O is evapourated at 100.0 oC, if the heat required is provided by a hot plate whose temperature is 329 oC. For water, ΔHvap is 40.79 kJ/mol. a. ΔSsystem? b. ΔSsurroundings? c. ΔSuniverse?