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3. Estimate the difference between the weight of air in a room that measures 20 x...
2. What mass of air is contained in a room 55 ft x 38 ft x...
2. What mass of air is contained in a room 55 ft x 38 ft x 12 ft at T = 68°F and p = 14.7 psia. (10 pts)
1. For the earth, an estimate of the variation of pressure with altitude above the surface of the earth is made for a gas of molecular weight, M, assuming the atmosphere is isothermal, the variation...
1. For the earth, an estimate of the variation of pressure with altitude above the surface of the earth is made for a gas of molecular weight, M, assuming the atmosphere is isothermal, the variation of g with altitude is negligible, and that the atmosphere behaves like an ideal gas. A significant error in this estimate arises from the assumption that the temperature of the atmosphere, T, is isothermal instead of decreasing with altitude. This decrease with altitude y in...
Please also explain the difference between delta H and delta U. Thanks! 2. Find the changes...
Please also explain the difference between delta H and delta U.
Thanks!
2. Find the changes in internal energy (AU) and enthalpy (AH) per kmol, for air going from 10 bar, 277 K and 2.28 m3/kmol (molar volume), to 333 K and 1 atm. Use the following: 4 Cp = 29.3 kJ kmol-? K-1 Cy = 21 kJ kmol-? K-1 PV/T = constant Do not use any additional properties of ideal gases. There is no need to prove the gas...
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and...
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and a 2-kW baseboard electric resistance heater in the room is turned on and kept on for 15 min. The temperature rise of air at the end of 15 min is 2)An example of when it is appropriate to model a substance as an ideal gas is when a. The pressure and temperature are close to the critcal point b. The pressure and temperature are...
56. Fresh air is introduced into a room at such a rate that the air in...
56. Fresh air is introduced into a room at such a rate that the air in the room is changed every 5 minutes. The room is 30 by 30 by 10 ft and the air in the room is at 70 °F with a percentage humidity of 60. Outside air at a temperature of 60 °F is used as air supply. The outside air is heated to the room temperature by a heat exchanger. How many BtU per hour must...
02. (20 POINTS) An unknown substance is empirically determined to be 40 percent carbon by weight,...
02. (20 POINTS) An unknown substance is empirically determined to be 40 percent carbon by weight, 6.67 percent hydrogen, and 53.33 percent oxygen. Its molecular weight is roughly 55 g/mol. gml. Determine the molecular formula and its correct molecular weight. (a) List all the assumption you may use in the solution (b) The solution should be organized and neat (c) The final answer should be labeled ( draw a box around your answer) Question Max Points Points D1 25 3...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures 3 m wide high and 6 m deep One of the two 3 m walls faces west and contains a do window of sıze 1 5 m by 1 5 m, mounted flush with the wall with no external s shading T the follo are no heat gains through the walls other than the one facing east From nformation Inside conditions 25 °C dry...
Air a. What is the volume of air in the room where you are right now?...
Air a. What is the volume of air in the room where you are right now? (You can measure the length, width, and height of the room with a measuring tape, or you can estimate these quantities. Just make sure you convert your answer to SI units.) b. What is the temperature in this room? (in SI units) c. Look up the current barometric pressure in your area, and convert it to SI units. d. Use the information from steps...
30) — 30) A barometer measures A) the difference in pressure between a gas sample and atmospheric pressure. B) the...
30) — 30) A barometer measures A) the difference in pressure between a gas sample and atmospheric pressure. B) the pressure of a gas sample in a container. C) atmospheric pressure. D) the pressure of an ideal gas. E) the difference in pressure between two gas samples. 31) 31) Which one of the following substances, with their structures shown, will NOT display hydrogen bonding? B C.HO D . ethanol E. diethyl ether A. NH, H-N- H HF -E: H H-C-H...
IDEAL GAS with Compressibility Factor Z correction Problem 2) Find the specific volume of the gas...
IDEAL GAS with Compressibility Factor Z correction Problem 2) Find the specific volume of the gas in Problem 1A(=1.48ft^3/lbm) using the compressibility factor Z. IDEAL GAS STATE Problem 1) Air is at 200F and a pressure of 50 psia. Assuming ideal gas estimate the specific volume of this air at this condition. Air at a density of 1.2 kg/m3 is at a pressure of 150 Kpa. Find the temperature of the air assuming ideal gas. Find the specific volume of...
2. What mass of air is contained in a room 55 ft x 38 ft x 12 ft at T = 68°F and p = 14.7 psia. (10 pts)
1. For the earth, an estimate of the variation of pressure with altitude above the surface of the earth is made for a gas of molecular weight, M, assuming the atmosphere is isothermal, the variation of g with altitude is negligible, and that the atmosphere behaves like an ideal gas. A significant error in this estimate arises from the assumption that the temperature of the atmosphere, T, is isothermal instead of decreasing with altitude. This decrease with altitude y in...
Please also explain the difference between delta H and delta U.
Thanks!
2. Find the changes in internal energy (AU) and enthalpy (AH) per kmol, for air going from 10 bar, 277 K and 2.28 m3/kmol (molar volume), to 333 K and 1 atm. Use the following: 4 Cp = 29.3 kJ kmol-? K-1 Cy = 21 kJ kmol-? K-1 PV/T = constant Do not use any additional properties of ideal gases. There is no need to prove the gas...
56. Fresh air is introduced into a room at such a rate that the air in the room is changed every 5 minutes. The room is 30 by 30 by 10 ft and the air in the room is at 70 °F with a percentage humidity of 60. Outside air at a temperature of 60 °F is used as air supply. The outside air is heated to the room temperature by a heat exchanger. How many BtU per hour must...
02. (20 POINTS) An unknown substance is empirically determined to be 40 percent carbon by weight, 6.67 percent hydrogen, and 53.33 percent oxygen. Its molecular weight is roughly 55 g/mol. gml. Determine the molecular formula and its correct molecular weight. (a) List all the assumption you may use in the solution (b) The solution should be organized and neat (c) The final answer should be labeled ( draw a box around your answer) Question Max Points Points D1 25 3...
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures 3 m wide high and 6 m deep One of the two 3 m walls faces west and contains a do window of sıze 1 5 m by 1 5 m, mounted flush with the wall with no external s shading T the follo are no heat gains through the walls other than the one facing east From nformation Inside conditions 25 °C dry...
30) — 30) A barometer measures A) the difference in pressure between a gas sample and atmospheric pressure. B) the pressure of a gas sample in a container. C) atmospheric pressure. D) the pressure of an ideal gas. E) the difference in pressure between two gas samples. 31) 31) Which one of the following substances, with their structures shown, will NOT display hydrogen bonding? B C.HO D . ethanol E. diethyl ether A. NH, H-N- H HF -E: H H-C-H...
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