1. n-Pentane gas goes through an isenthalpic (∆H = 0) process known as throttling. The pentane gas starts at 170 bar and 375 K, and ends at 3.5 bar, where it is partially condensed.

b.) (20 pts) What is the sensible heat released from the initial state to the saturated vapor state at 3.5 bar? Note: at no point in this process is the gas behaving as an ideal gas.

c.) (10 pts) What is the heat of condensation (∆H_cond = -∆H_vap) at the temperature corresponding to a saturation pressure of 3.5 bar?

d.) (10 pts) What fraction of the vapor condenses? Recall, for the process, ∆H = 0.

ans:

B: Hr1=-22.2 kJ/mol; H2r=-1.016 kJ/mol; ∆Hig = -3.384 kJ/mol; ∆H = 1.7822 kJ/mol

C.) ∆Hcond = -23.061 kJ/mol; D.) xL = 0.773;

1. n-Pentane gas goes through an isenthalpic (∆H = 0) process known as throttling. The pentane gas starts at 170 bar and 375 K, and ends at 3.5 bar, where it is partially condensed.

b.) (20 pts) What is the sensible heat released from the initial state to the saturated vapor state at 3.5 bar? Note: at no point in this process is the gas behaving as an ideal gas.

c.) (10 pts) What is the heat of condensation (∆H_cond = -∆H_vap) at the temperature corresponding to a saturation pressure of 3.5 bar?

d.) (10 pts) What fraction of the vapor condenses? Recall, for the process, ∆H = 0.

ans:

B: Hr1=-22.2 kJ/mol; H2r=-1.016 kJ/mol; ∆Hig = -3.384 kJ/mol; ∆H = 1.7822 kJ/mol

C.) ∆Hcond = -23.061 kJ/mol; D.) xL = 0.773;

how does the Biochemical Oxygen Demand method work?

A hydrocarbon feed consisting of a mixture of propane (20%), isobutene (30%), isopentane (20%), and n-pentane (30%) is fractionated at a rate of 100 kg/h into a distillate that contains all the propane and 78% of the isopentane in the feed. The mole fraction of isobutane in the distillate is 0.378. The bottom stream contains all the n-pentane fed to the unit. Determine the flow rate of the bottom stream. provide a flow chart with component and mass of each inlet and outlet

derive the expressions for the thermodynamic properties Helmholtz free energy, entropy, pressure, chemical potential and internal energy for the canonical ensemble as a function of the partition function

The following shows the gas phase decomposition of hydrogen peroxide (H2O2) at 400 °C: 2H2O2(g)2H2O(g) + O2(g)

This reaction is second order in H2O2 with a rate constant of 0.650 M-1s-1 and the initial concentration of H2O2 is 0.600 M.
a) What is the concentration of H2O2 after 40 second? (extra credit) What is the concentration of O2

at that time?
b) Calculate the first and second half-life of this reaction. Are the values same or different?

Explain your answer.

What type of defects and how many are likely to be created when 1.5 moles of NiO are added to 97.5 moles of SiO2?

The structure of NaCl is given. Determine its lattice constant, a, and its density. Hint: since NaCl is ionic use the ion radius data and the atomic radii.

Express the continuity equation in index notation

What property of an initiator will cause the polymer molecular weight to become broader?

A steam turbine receives steam from two boilers. One flow is 5 kg/s at 3 MPa, 700°C and the other flow is 15 kg/s at 800 kPa, 500°C. The exit state is 10 kPa, with a quality of 96%. Find the total power out of the adiabatic turbine. Calculate the efficiency of the turbine

write the degrees of freedom (F) and the state the water is in. Calculate quality or degrees of superheat if applicable.

a. What is the specific volume and vapor pressure (saturation pressure) of saturated liquid at 64° C?

b. What is the specific volume and vapor pressure of saturated vapor at 174 °C?

c. What is the quality of wet steam if V= 8.35 cm3/g at 10,703 kPa? What is the saturation temperature What is the specific internal Energy?

How to minimize emissions from catalytic reforming unit in a refinery?

Give at least 5 examples.

Using Penman’s method, estimate the Etp for July 15, 1994, from a field at an elevation of 200 m. The average temperature for July 15 was 16° C, with a maximum T of 22° C and a minimum of 10° C. The previous day’s average temperature was 14° C, and the following day’s average temperature was 21° C. The early morning actual vapor pressure on July 15 was 1.3 kPa: the wind speed was 2 m/sec, and Rn was 15 MJ/m2/d. (heat index was found to be 40 and saturated vapor pressure was found to be 2.0 kPa)