Assume that the tank volume is 25.0 m3, the temperature 25.0°C and the gauge pressure 15.0 bar. Calculate the mass of nitrogen in the tank using the ideal-gas equation of state. Now assume that the tank volume is 35.0 m3, the temperature 25.0°C and the gauge pressure 9.00 bar. Use conversion from standard conditions to estimate the mass of nitrogen in the tank.

A fluid that is gas under ambient conditions is stored in a 2m^3 tank.The amount of the gas in the tank is 150 mol. Estimate the fugacity of the gas.

A physics experiment is conducted at a pressure of 14.0 kPa. What is this pressure in mmHg? 105 mmHg 18.4 mmHg O1.87 mmHg O1.40 x 10ª mmHg O1.84 x 102 mmHg

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A 10 ft3 tank is used to contain propane with a bursting pressure of 400 psia. Safety considerations dictate that the tank be charged with no more propane than would exert a pressure half of the bursting pressure at a temperature of 260 0F. How many pound mass of propane may be charged to the tank? Note that propane at these conditions cannot be considered an ideal gas.

A pressurized tank of water has a 10-cm diameter orifice at the side bottom corner of the tank, where the water is being discharge to the atmosphere. The water level is 3 meters above the orifice. The tank air pressure above the water level is 300 kPa. Neglecting frictional effects, the initial discharge rate of water in kilograms per second (kg/s) from the tank is

d) Steam at 7 MPa and 300°C is throttled adibatically during a steady flow process in a valve to saturated vapour at 3 MPa as shown in Figure 2. Figure 2 Write the rate form basis entropy balance in its most general form. i) ii) Using the entropy balance you have written in i), obtain the entropy balance expression for the throttle above and use it to determine the entropy generated in kJkg during the throttling process. Comment on whether the increase in entropy principle is obeyed. iii)

0.07 kg of propane is contained in a piston-cylinder assembly at a constant pressure of 2.7 bar. Heat transfers slowly to the propane, and the volume of the propane increases from 0.029 m3 to 0.036 m3. The piston is free floating with negligible weight. Friction between the piston and cylinder is negligible. The propane may be assumed to be an ideal gas and experiences no significant kinetic and potential energy effects. Determine the heat transfer (in kJ) for this process. Data: R = 0.1886 kJ/kg.K, Cv = 1.490 kJ/kg.K (constant)

6) Calculate the absolute entropy for 1 mole of Ar gas (monatomic) with 22.4 liter volume at 273 K using Boltzmann's formula. What is the change in entropy if the temperature doubles while V is constant? What is the change in entropy if the volume doubles while T is constant? What is the change in entropy if both T and V double? (Note: To evaluate In(N!) use Stirling's asymptotic formula In(N!) ~ N In N – N ) S-k log W LVDWIG BOLTZMANN 18W-1906 DE FHILPAULA BOLTZMANN GER CAR

(b) Air at 37.8 C and pressure of 101.3 kPa flows past a sphere of naphthalene. The diameter of the sphere is 22.4 mm. The diffusivity of naphthalene in air at 37.8 C is 8.12×10*° m²/s and the vapor pressure of naphthalene is 70 Pa. The velocity of the air is 0.48 m/s. Assume naphthalene is dilute in air (ybm = 1). Given that the viscosity of air at 37.8 C is 1.90 × 10° Pa.s and the density is 1.137 kg/m. Calculate the mass-transfer coefficient (kc) and the flux (NA).