Homework Answers
![→ @ AT = 376 – 372.63 = 3.37 K T = 58.9 x 10-3 Nlm o 20 Tout x Vfg -> R = hfg XAT 2 x 58.9x103 x 372.63 x{1,6939- 0.00104] 22](http://img.homeworklib.com/questions/d32fad30-c74b-11eb-a2d2-d52e0a059a7e.png?x-oss-process=image/resize,w_560)
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3. (10 points) Assume that a container of liquid purified water at P=1 bar can be...
4. (4 points) Liquid water enters a steady-state heat exchanger at P 1 MPa and T-353.15...
4. (4 points) Liquid water enters a steady-state heat exchanger at P 1 MPa and T-353.15 K, and exits as saturated water vapor at P-1 MPa A. Using the steam tables, find the change in specific enthalpy for this process. B. Using the approximation that Cp-4.19 kJ/kg-K for liquid water, find the change in enthalpy when liquid water is heated from 353.15 K to its boiling point at P 1 MPa. C. How do the answers to parts A and...
gas is on top of liquid. 2. 24.5g water is in a container at 30.0L at...
gas is on top of liquid.
2. 24.5g water is in a container at 30.0L at 298.15 K. The vapor pressure of water at this temperature is 0.030 atm. The gas constant is 0.08206 L'atm/(mol-K). The density of water is 998 kg/m. The molar mass of water is 18.02 g/mol. a. What phases are present in this container At what volume would only the gas phase be present? b. At what volume would only liquid be present? C.
2. 24.5g...
1. Liquid nitrogen at −196° C (nitrogen’s boiling point) is placed in a container with 3...
1. Liquid nitrogen at −196° C (nitrogen’s boiling point) is placed in a container with 3 kg of water at 25° C. (a) Suppose you add just enough liquid nitrogen such that all the water just freezes (i.e., the final state of the water is ice at 0° C). Draw a complete energy interaction diagram for this scenario, including a conservation of energy equation. (b) How much liquid nitrogen should you put in the container such that all the water...
In a closed container, one gram of water (1 cm) is boiled under constant pressure of...
In a closed container, one gram of water (1 cm) is boiled under constant pressure of 1 atm (1.013 10Pa) until it changes into steam. The heat of vaporization at this pressure is Lv = 2.256 x 106J/kg = 2256 J/g. Assume that water vapor behaves like an ideal gas. The temperature of the steam is 373 K, number of moles of water vapor n = 0.0546 (g mol), the ideal gas constant R = 82.057 (cm3.atm/g mol-K). (a) How...
A rigid container of volume 10 m^3 stores 11.221 kg of water initially as vapor and...
A rigid container of volume 10 m^3 stores 11.221 kg of water initially as vapor and liquid at (T_1) 85 degree C. What is the pressure (P_1) of the system? What is the quality (q_1) of the system? When the temperature of the container is raised to T_2 = 105 degree C, what is the quality of the system (q_2), and what is the pressure (P_2)? What are the changes of enthalpy (Delta H) and changes of internal energy (Delta...
17. (10 pts) Solid potassium metal reacts with liquid water to produce aqueous potassium hydroxide and...
17. (10 pts) Solid potassium metal reacts with liquid water to produce aqueous potassium hydroxide and hydrogen gas as shown by the BALANCED chemical equation below. When a 3.50 g piece of K(s) is added to 150. g of water in an insulated container, the temperature of the liquid INCREASES from 25.0 °C to 65.8 °C. Calculate the enthalpy of reaction (4FH) for the reaction in the forward direction. Water has a heat capacity (Cp) of 4.18 J/(8 °C). Assume...
In an isobaric process, 1 litre of compressed liquid water at p 10 MPa, T 40°C...
In an isobaric process, 1 litre of compressed liquid water at p 10 MPa, T 40°C is heated to saturated liquid state (State 2), then evaporated to saturated vapor state (State 3), and then further heated to T4-450°C. Determine temperature, pressure, specific volume, internal energy, enthalpy and entropy in the four states; collect the data in a table. Then determine the work and the heat for the process. For state 1, also use the approximation based on saturation data to...
Refer to Figure 3 (below), depicting a regenerative Rankine cycle with a closed feedwater heater (CFWH) when considering the following system description. Saturated liquid water at a pressure of P b...
Refer to Figure 3 (below), depicting a regenerative Rankine cycle with a closed feedwater heater (CFWH) when considering the following system description. Saturated liquid water at a pressure of P before entering the CFWH. 12 kPa is pumped to a pressure of Pi-5 MPa After leaving the CFWH as a saturated liquid, the water continues to a Steam Generator which heats the water to a temperature of Ts 600°C. This superheated steam is used to drive a Turbine. A quantity...
Problem 3: Complete the following data based on the provided tables for water State 1: Pi...
Problem 3: Complete the following data based on the provided tables for water State 1: Pi = 200 kPa Tl-500°C State 2: P2 300 kPa T-1 160°C phase2- State 3: State 4: P 175 kPa P4 250 kPa ei phases Sat. vapor phase4 v0.630 /kg a7 Saturated water- Pressure table Specific volume m-/k Internal energy kJ/k Sat. Sat. Sat liquid, Evap, vapor, Press, temp, liquid, vapor LI 116,04 0.001057 1.0037 486.82 2037.7 2524.5 120.21 0.001061 0.88578 504.50 2024.6 2529.1 123.97...
4. Comparison of process paths: Calculate the AH for 1 kg of water going from liquid...
4. Comparison of process paths: Calculate the AH for 1 kg of water going from liquid at the triple point of water (0.01 °C and 0.0061 bar) to saturated steam (100 °C, 1 atm) by two different process paths. The two paths are defined as a. liquid water at triple point to saturated vapor at the triple point, followed by heating the saturated vapor to 0.0061 bar to saturated vapor at 1 atm. b. liquid water at triple point heated...
4. (4 points) Liquid water enters a steady-state heat exchanger at P 1 MPa and T-353.15 K, and exits as saturated water vapor at P-1 MPa A. Using the steam tables, find the change in specific enthalpy for this process. B. Using the approximation that Cp-4.19 kJ/kg-K for liquid water, find the change in enthalpy when liquid water is heated from 353.15 K to its boiling point at P 1 MPa. C. How do the answers to parts A and...
gas is on top of liquid.
2. 24.5g water is in a container at 30.0L at 298.15 K. The vapor pressure of water at this temperature is 0.030 atm. The gas constant is 0.08206 L'atm/(mol-K). The density of water is 998 kg/m. The molar mass of water is 18.02 g/mol. a. What phases are present in this container At what volume would only the gas phase be present? b. At what volume would only liquid be present? C.
2. 24.5g...
In a closed container, one gram of water (1 cm) is boiled under constant pressure of 1 atm (1.013 10Pa) until it changes into steam. The heat of vaporization at this pressure is Lv = 2.256 x 106J/kg = 2256 J/g. Assume that water vapor behaves like an ideal gas. The temperature of the steam is 373 K, number of moles of water vapor n = 0.0546 (g mol), the ideal gas constant R = 82.057 (cm3.atm/g mol-K). (a) How...
A rigid container of volume 10 m^3 stores 11.221 kg of water initially as vapor and liquid at (T_1) 85 degree C. What is the pressure (P_1) of the system? What is the quality (q_1) of the system? When the temperature of the container is raised to T_2 = 105 degree C, what is the quality of the system (q_2), and what is the pressure (P_2)? What are the changes of enthalpy (Delta H) and changes of internal energy (Delta...
17. (10 pts) Solid potassium metal reacts with liquid water to produce aqueous potassium hydroxide and hydrogen gas as shown by the BALANCED chemical equation below. When a 3.50 g piece of K(s) is added to 150. g of water in an insulated container, the temperature of the liquid INCREASES from 25.0 °C to 65.8 °C. Calculate the enthalpy of reaction (4FH) for the reaction in the forward direction. Water has a heat capacity (Cp) of 4.18 J/(8 °C). Assume...
In an isobaric process, 1 litre of compressed liquid water at p 10 MPa, T 40°C is heated to saturated liquid state (State 2), then evaporated to saturated vapor state (State 3), and then further heated to T4-450°C. Determine temperature, pressure, specific volume, internal energy, enthalpy and entropy in the four states; collect the data in a table. Then determine the work and the heat for the process. For state 1, also use the approximation based on saturation data to...
Refer to Figure 3 (below), depicting a regenerative Rankine cycle with a closed feedwater heater (CFWH) when considering the following system description. Saturated liquid water at a pressure of P before entering the CFWH. 12 kPa is pumped to a pressure of Pi-5 MPa After leaving the CFWH as a saturated liquid, the water continues to a Steam Generator which heats the water to a temperature of Ts 600°C. This superheated steam is used to drive a Turbine. A quantity...
Problem 3: Complete the following data based on the provided tables for water State 1: Pi = 200 kPa Tl-500°C State 2: P2 300 kPa T-1 160°C phase2- State 3: State 4: P 175 kPa P4 250 kPa ei phases Sat. vapor phase4 v0.630 /kg a7 Saturated water- Pressure table Specific volume m-/k Internal energy kJ/k Sat. Sat. Sat liquid, Evap, vapor, Press, temp, liquid, vapor LI 116,04 0.001057 1.0037 486.82 2037.7 2524.5 120.21 0.001061 0.88578 504.50 2024.6 2529.1 123.97...
4. Comparison of process paths: Calculate the AH for 1 kg of water going from liquid at the triple point of water (0.01 °C and 0.0061 bar) to saturated steam (100 °C, 1 atm) by two different process paths. The two paths are defined as a. liquid water at triple point to saturated vapor at the triple point, followed by heating the saturated vapor to 0.0061 bar to saturated vapor at 1 atm. b. liquid water at triple point heated...
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