Balloon planes are filled with 5,000 moles of helium. The initial helium state is 101.325 kPa and 298 K. As the aircraft increased its altitude, it decreased to 96.3 kPa and 288 K. Find changes in helium volume, internal energy, and enthalpy in this process. Helium is an ideal gas and has Cv=1.5 R.

Balloon planes are filled with 5,000 moles of helium. The initial helium state is 101.325 kPa and 298 K. As the aircraft increased its altitude, it decreased to 96.3 kPa and 288 K. Find changes in helium volume, internal energy, and enthalpy in this process. Helium is an ideal gas and has Cv=1.5 R.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Steam at 130 bar has a specific volume of 0.1726 m'/kg. Determine the temperature, the specific enthalpy, and the specific internal energy. If the specific volume increased to the 0.1901 m'/kg at same pressure. Determine the temperature, specific enthalpy and specific internal energy and analyze the results obtained form (a) and (b).
The pressure change during a particular reversible process is given by T = AP2 where A is a constant. A monatomic ideal gas is taken through this process from a temperature of 4T0 to 16T0. The sample of gas consists of n moles. (Hint: You must express the pressure in terms of volume using the equation for the process and the ideal gas law.) Compute the work done by the gas in terms of n, R, and T0 (and appropriate numerical constants) only. Compute the change in heat for the gas in terms of n, R, and T0 (and appropriate numerical constants) only. Compute the change in entropy for the gas in terms of n, R, and T0 (and appropriate numerical constants) only.
An unknown gas at p1=95psia and V1=4 ft3undergoes a process to p2=15psia and V2=16.56 ft3, during which the enthalpy decreases 83 Btu; cv= 0.1573Btu/lbR. Determine (a) cp, (b) R , and (c) AU.
A monatomic ideal gas initially fills a V0 = 0.45 m3 container at P0 = 85 kPa. The gas undergoes an isobaric expansion to V1 = 0.75 m3. Next it undergoes an isovolumetric cooling to its initial temperature T0. Finally it undergoes an isothermal compression to its initial pressure and volume. (a). Calculate the work done by the gas, W1, in kilojoules, during the isobaric expansion (first process). (b). Calculate the heat absorbed Q1, in kilojoules, during the isobaric expansion (first process). (c) Calculate the heat absorbed Q2, in kilojoules, during the isovolumetric cooling (second process). (d) Calculate the change in internal energy by the gas, ΔU2, in kilojoules, during the isovolumetric cooling (second process). (e) Calculate the work done by the gas, W3, in kilojoules, during the isothermal compression (third process). (f) Calculate the heat absorbed Q3, in kilojoules, during the isothermal compressions (third process).
hydrogen gas is compressed from an initial state of P1=20 psia and 40 F to a final state of p2=60 psia and 228 F. what is the process?
Air is compressed from 1 atm to 6 atm, resulting to a temperature increase in the amount of 100 deg C from initial temperature of 25 deg C and volume of 20 liter. How much volume in liters would it occupy after compression? Note that air can be safely assumed as an ideal gas.
Determine the specific volume, internal energy and enthalpy of compressed liquid at 120 °C and 15MPa.
ANSWER ALL THREE AND GET A LIKE <3 The density of helium is 0.178 kg/m3 at STP. What is the density in kg/m3 at 25°C and 98 kPa? A steel tank initially contains oxygen gas at 450 kPag and 20°C. After 2.5 kg of oxygen had been used, the pressure and temperature of the gas in the tank was found to be 180 kPag and 20°C, respectively. What was the initial mass of oxygen in the tank in kg? A 1500-L tank contains nitrogen at a pressure of 400 kPag and a temperature of 320K. Later, because of a leak, it was found that the gage pressure has dropped to 320 kPag and the temperature has decreased to 300K, determine the amount of nitrogen that has leaked out in kg.
Determine the mass of air in lbm when the pressure is 17.97 psi and the temperature is 94.9°F in a closed chamber with dimensions 26.4 ft x 18 ft x 17.9 ft. Assume air to be an ideal gas.
Consider a sealed can that is filled with 4.4 kg of water at 115 °C and P = 248 kPa. Now a leak develops, and the pressure in the can drops to the local atmospheric pressure of 100 kPa (Cp=4.23 kJ/kg.K). The vapor leaves the can as soon as it is formed. How much vapour will evapourate before the liquid water reaches its boiling temperature at atmospheric pressure. NB: water's enthalpy of vapourisation is roughly 2257 kJ/kg . a. 4.400 kg b. 0.120 kg c. 1.093 kg d. 0.030 kg e. 0.015 kg
An ideal gas at 27°C is compressed adiabatically to 8/27 of its original volume. The rise in temperature is (take, y = 5/3) (a) 475°C (c) 275°C (b) 150°C (d) 402°C
A 3-m3 rigid tank contains hydrogen at 250 kPa and 550 K. The gas is now cooled until its temperature drops to 340 K. Determine; (a) the final pressure in the tank (b) find the mass of hydrogen in the tank (kg)