For a refrigerator let us consider the following quantities: The absolute value of the amount of heat that a refrigerator absorbs from the cold reservoir (its internal part): |Q₁| The absolute value of the amount of heat that the refrigerator releases to the environment: |Q₂|. We can state that: a) 1Q₁1=10₂1 b) 1Q₁1>1Q₂1 c) 1Q₂|>1Q11 d) whether Q₁ | is greater than, less than or equal to Q₂| depends on the performance of the cooler.
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- One process for decaffeinating coffee uses carbon dioxide ( M=44.0 g/mol) at a molar density of about 14,0 mol/m3 and a temperature of about 60 . (a) Is CO2 a solid, liquid, gas, or supercritical fluid under those conditions? (b) The van der Waals constants for carbon dioxide are a=0.3658 Pa m6/mol2 and b=4.286105 m3/mol. Using the van der Waals equation, estimate pressure of CO2 at that temperature and density. `Problem 2: The enthalpy of a system is given by the equation H = U + PV where U is the internal energy, P = pressure, and V = volume. In addition, the internal energy, U = Q + W where Q is the heat and W is the work. Suppose we want to find the rate of change in the enthalpy at constant pressure of 1.25 atm, what is the value when heat is absorbed by the system at a rate of 45 J/s and work is done by the system at a rate of 100 J/s when the change of volume is rated at 35 x 105 m/s? 1. What is the change in heat with respect to time? 2. What is the change in internal energy of the system with respect to time? 3. What is the change in enthalpy of the system with respect to time?The heat engine shown in the figure uses 2.0 mol of a monatomic gas as the working substance. (Figure 1) Figure p (kPa) 600 400 200 0 0 0.025 0.050 V (m³) 1 of 1 Part A Determine T₁, T2, and T3. Enter your answers numerically separated by commas. Express your answer using two significant figures. T₁, T2, T3 = 600,1800,1200 K Submit Previous Answers Correct Part B
- Ue A:0r * Il. pluls ► exam 1.pdf Q1// Define the following First law of thermodynamics, adiabatic process, Boyle's law, Reversibility, and Pressure. Q2// Ten kg of oxygen are heated from 350 to 500 K at constant pressure. Calculate the change of enthalpy, change internal energy, heat transfer and work done. Take Cp-0.909, Cv=0.649 Q3// In a nozzle air at 700°C and twice atmospheric pressure enters with 50 m/s velocity, and leaves at a temperature of 40°C. Determine velocity of air at exit. Take Cp = 1.005 kJ/kg.K for air.A bottle of volume V = 0.15 m³ contains helium gas (a monatomic gas) at a pressure p = 722,266 Pa (Pascal = N/m² and temperature T = 300 K. Calculate a numerical value for the internal energy U of this gas. Include units in your answer, using Sl units (m for meters, kg for kilograms, s for seconds, J for joules, K for kelvin, etc.). Write your answer as an exponential as described in the instructions.The heat engine shown in the figure uses 2.0 mol of a monatomic gas as the working substance. (Figure 1) Figure p (kPa) 600 400 200 0 0 0.025 0.050 V (m³) 1 of 1 Determine T₁, T2, and T3. Enter your answers numerically separated by commas. Express your answer using two significant figures. T₁, T2, T3 Submit ✓ Correct Part B 600,1800,1200 K Previous Answers Determine AEth, Ws, and Q for 1-2. Enter your answers numerically separated by commas. Express your answer using two significant figures. 15. ΑΣΦ AEth, Ws, Q = 30, 12.5,42.5 Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining ? J
- A monatomic ideal gas undergoes an isothermal expansion at 300 K, as the volume increased from 0.020 to [2*v1] m³.The final pressure is 120.61kPa. The ideal gas constant is R = 8.314 J/mol · K. %3D What is the heat transfer Q to the gas in kilojoules? Please enter your numerical answer with two decimal places. (for example for 2090 J, enter 2.09 )⦁ When a certain quantity of helium gas contained inside and engine cylinder combusts, the expanding gas causes the 12-cm-radius piston to move outward by 10.0 cm. If the gas remains at a pressure of 120 kPa for this process, what is the heat transfer? (See the diagram at the top of the next page.)⦁ 1,960 J⦁ 1,660 J⦁ 1,360 J⦁ 1,060 J⦁ 760 J(17 blanks) Calculate the efficiency of the Carnot Engine for ideal gas. Consider the figure below for a complete cycle of Carnot engine, where the cycle goes from ad->ab->bc->cd Carnot cycle Он TH Tc © 2016 Pearson Education, Inc. processes; and the volumes involved are Va, Vb, processes and segment ab & cd are the Where segments ad & bc are the Vc, Vd, and the two temperatures TC and Sol. Since AU = 0, then the heat on segment ab is TH In | QH =
- The enthalpy of a system is given by the equation H=U+PV where U is the internal energy, P=pressure, and V=volume. In addition, the internal energy, U=Q+W where Q is the heat and W is the work. Suppose we want to find the rate of change in the enthalpy at constant pressure of 1.75 atm, what is the value when heat is absorbed by the system at a rate of 55 J/s and work is done by the system at a rate of 200 J/s when the change of volume is rated at 76 x 10^-5 m^3/s? 1. What is the change in heat with respect to time?2. What is the change in internal energy of the system with respect to time?3. What is the change in enthalpy of the system with respect to time?The heat engine shown in the figure uses 2.0 mol of a monatomic gas as the working substance. (Figure 1) Figure p (kPa) 600 400 200 0 0 0.025 0.050 < 1 of 1 V (m³) Part D Determine AEth, Ws, and Q for 3→1. Enter your answers numerically separated by commas. Express your answer using two significant figures. VE ΑΣΦ AEth, Ws, Q = Submit Part E Request Answer What is the engine's thermal efficiency? Express your answer using two significant figures. ? JA heat pump with a COP of 2.8 is used to heat an air-tight house. When running, the heat pump consumes 5 kW of power. If the temperature in the house is 7°C when the heat pump is turned on, how long will it take for the heat pump to raise the temperature of the house to 22°C? Is this answer realistic or optimistic? Explain. Assume the entire mass within the house (air, furniture, etc.) is equivalent to 1500 kg of air.