Using average specific heats, explain how enthalpy changes of ideal gases and incompressible substances can be determined
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Using average specific heats, explain how enthalpy changes of ideal gases and incompressible substances can be determined
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- Using average specific heats, explain how internal energy changes of ideal gases and incompressible substances can be determined.If 15.7 m³ of atmospheric air at 149 degrees centigrade temperature are compressed to a volume of 11.2 m³ at zero degrees centigrade, what will be the vacuum pressure of air in kPav?A cylinder contains an amount of gas. At pressure of 460 kPa and at temperature of 27 ̊C, thegas occupies a volume of 0.08 m3. It is then compressed according to Boyle’s law until its pressureis 1.2 MPa, and then expanded according to Charles’ Law until its volume is 0.05 m3. Calculate thefinal temperature of the gas.
- Which is higher for gases, specific heat in constant volume or specific heat in constant pressure? Explain why.consider air at 350 K and 0.75 m3/kg. using equation Dz=(dz/dx)y*dx + (dz/dy)x*dy, determine the change in pressure corresponding to an increase of (a) 1 percent in temperature at constant specific volume. (b) 1 percent in specififc volume at constant temperature. and (c) 1 percent in both the temperature and specific volume.A gas is initially at 0 gage pressure and compressed to 1/4 of the initial volume at constant temperature. What is the new gage pressure?(include units with answer)
- Determine the pressure, specific volume, and internal energy of water at 25 C and a quality of 70%We define the specific ideal gas constant Rgas for a particular gas as the ratio of the universal gas constant and the molar mass (also called molecular weight) of the gas, Rgas = Ru/M. For a particular gas, then, the ideal gas law is written as follows: PV = mRgasT or P = ρRgasT where P is pressure, V is volume, m is mass, T is absolute temperature, and ? isthedensityoftheparticulargas.Whatare the primary dimensions of Rgas? For air, Rair = 287.0 J/kg·K in standard SI units. Verify that these units agree with your result.A brass container has a volume of 2.800 L and is filled with 2.790 L of water at a common temperature of 15.0 °C. The container and water are heated uniformly to 95.0 °C. Ignore heat loss and evaporation to the surrounding. Given that: Coefficient of volume expansion of brass, Bbrass = 57.0 × 10-6 °C-1 Coefficient of volume expansion of water, Bwater= 207 × 106 °C-1 (i) Calculate the change in the volume (in L) of the water and brass container respectively. (ii) Determine whether the water will overflow from the container. Support your answer with mathematical steps.
- A 40 centimeters diamater cylindrical container with a height of 50 centimeters carries a mixture of saturated liquid and saturated vapor water at volume ratio 1:9 liquid to vapor. If the temperature of the system is 100 degrees Celsius, what is the total mass (in kg) of water in the container?A rigid tank whose dimensions (0.5m 0.7m 1.2m ) of saturated water vapor at 44 psi pressure. Determine the temperature and the mass of the vapor inside the tank.A 6m3 tank contains helium at 127C and is evacuated from atmospheric pressure to a pressure of 730 mm Hg Vacuum. Determine the mass of helium remaining in the tank. MW of Helium is 4kgm/kgmol