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4. Air (CP = 1.005 kJ/kg°C) is to be preheated by hot e...

4. Air (CP = 1.005 kJ/kg°C) is to be preheated by hot exhaust gasses in a cross-flow heat exchanger before it enters a furnace. Air enters the heat exchanger at 95 kPa and 15°C at a rate of 9 m³/s. The combustion gasses (CP = 1.1 kJ/kg°C) enter at 280°C at a rate of 3.1 kg...

1. Calculate the equilibrium constant Kp at 1200K for the r...

1. Calculate the equilibrium constant Kp at 1200K for the reaction Na Na2 using the following data: Crot (Na2) = 0.221K, O vib (Na2) = 229K, Do = 72.1 kJ/mole. Ground electronic state of sodium atom is 2S1/2 2. Prove, that if diatomic molecules A and A' differ only by isotopic substi- tution,...

1. The saturation vapor pressure at 25 °C is 31.67 mb. ...

1. The saturation vapor pressure at 25 °C is 31.67 mb. (a) What is the partial vapor pressure at 25 °C if the dew point is 5 °C? (b) What is the mixing ratio r, if the pressure is 1000 mb? (c) If the parcel expands to 800 mb, what will be the new vapor pressure and the mixing ratio?...

3. Alcohol (you can also call it a bio-fuel) is an alternati...

3. Alcohol (you can also call it a bio-fuel) is an alternative fuel, consider liquid methanol burned with stoichiometric air both supplied at Po: To in a constant pressure process exhausting the products at 900 K. What is the heat transfer per kmol of fuel.

The Kronig-Penney model is a 1D square-well approximation fo...

The Kronig-Penney model is a 1D square-well approximation for a periodic array of charged nuclei, as shown below. d(x) d, - E X - -C +b +a Period =a In terms of the parameters a2 = 2mE/ h2 and B2 = - the Schrödinger equation can be written as dty + d2 = 0 05x5b dx² dty -B2...

1 D" layer region: slab graveyard The D"...

1 D" layer region: slab graveyard The D" region (a high density/low shear-velocity layer on top of the core-mantle boundary seen by seismologists) is known to be a slab graveyard, where cold subducted oceanic lithosphere ends up. We can quickly test this hypothesis based on som...

1 Maxwell visco-elastic body (2 pts) Consider the Maxwell ...

1 Maxwell visco-elastic body (2 pts) Consider the Maxwell visco-elastic body discussed in lecture, for which the strain e and stress o satisfy the following equation 0-1-10-00 + (1) where k is the Young's modulus, and n is the viscosity. Assume a constant strain eo is applied suddenly at t = ...

1. Write the formula's for changes in an isothermal process ...

1. Write the formula's for changes in an isothermal process for u. h and S for a gas with an equation of state as P (V - b) = RT. 2. How low should the pressure be so that nitrous oxide (N2O) gas at 278.6 K can be treated as an ideal gas with 5% accuracy or better? 3. A very low temperature re...

2. (30 pts) A piston-cylinder contains 0.1kg saturated liqui...

2. (30 pts) A piston-cylinder contains 0.1kg saturated liquid water at 10 bars. Energy is added until all the liquid has just evaporated. The properties of the H2O at the initial and final state are given below for your convenience (from A-13). The boundary temperature where heat transfer occurs i...

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