Briefly discuss whether fossil-fuel derived energy can ever be environmentally friendly?

a. If a 6 cm diameter cylinder containing 2 g of an ideal gas at 25o C is fitted with a 5 kg piston with a 20 kg weight on the piston, calculate the pressure and volume of the ideal gas if the atmospheric pressure is 1 atm. If the 20 kg weight is removed, provide detailed comments without further calculations on what would happen. You may assume a molecular weight of 28 for the gas.

b. Calculate the energy required to heat a gas from 30o C to 150o C if the gas flow rate and pressure at the heater outlet are 1.5 m3 /min and 125 kPa absolute respectively. Assume the specific enthalpy change is about 4,000 J/mol for the process.   

1.) Determine the number of moles of hydrogen atoms in each sample.

**Round to 2 Sig Figs**

a.)8.95×10^?2 mol C4H10

b.)1.5 mol CH4

c.)2.8 mol C6H12

d.)1.80 mol C8H18

2.) A sample of a compound is decomposed in the laboratory and produces 660 g carbon, 139.0 g hydrogen, and 220.2 g oxygen. Calculate the empirical formula of the compound.

**Express your answer as an empirical formula.**

Case study: Bophal disaster. Research and write a detailed report on the disaster and some of the key lessons from this inciden

Consider the reactor system shown below. The reaction is exothermic so a cooling system is provided to remove the excess energy of the reaction. In the event that the cooling function is lost, the temperature of the reactor would increase. This would lead to an increase in reaction rate, leading to an additional energy release. The result would be a runaway reaction with pressures exceeding the bursting pressure level of the reactor vessel. The temperature within the reactor is measured and is used to control the cooling water flow rate by a valve. Perform a HAZOP study on this unit to improve the safety of the process. Use as a study node the cooling coil (process parameters: flow and temperature) and the stirrer (process parameters: agitation)

4.17 A rigid insulated tank is divided into two parts, one that contains 1 kg of steam at 10 bar, 200 °C, and one that contains 1 kg of steam at 20 bar, 800 °C. The partition that separates the two compartments is removed and the system is allowed to reach equilibrium. What is the entropy generation?

This is the problem in the book Fundamentals of Chemical Engineering Thermodynamics 1st edition. In the solution, it says first obtain volume and internal energy at 15.85 bar. Can you tell me how did the answer get 15.85 bar?

How will understanding the key elements of process safety and occupational safety allow chemical technicians to contribute significantly to the reduction of risks and hazards

A pump takes water at 60°F from a large reservoir and delivers it to the bottom of an open elevated tank 25 ft above the reservoir surface through a 3 inch ID pipe. The inlet to the pump is located 10 ft below the water surface, and the water level in the tank is constant at 160 ft above the reservoir surface. The pump delivers 150 gpm. If the total loss of energy due to friction in the piping system is 35 ft·lbf/lb, calculate the horsepower required to do the pumping. The pump and its motor have an overall efficiency of 55 percent. write out the equations you use. specificy what each variable stands for.

Explain the definition of AR (Augmented Reality) and suggest further problems about expanding services from it.

A sand particle has an average diameter of 1 mm and a shape factor of 0.90 and a specific gravity of 2.1, determine the terminal velocity of the particle settling in water at 20^oC (kinematic viscosity of water = 1.003 x 10^-6 m²/s and specific gravity = 1) Drag coefficient can be computed using the formula:

Cd= 24/Re +( 3/sqrtRe ) + 0.34

  Answer: 0.1419 m/s

Give a description of polymer silk

1) Why is considered as an advanced material?

2) Why does behave like an advanced material?

3) What are the applications where we can use it?

Acetic acid is to be extracted from benzene into water at 25C. 100 kg/h of a feed that is 0.0092 wt. fraction acetic acid and 0.9908 wt. fraction benzene is fed to a column. The inlet water is pure and flows at 25 kg/h. The desired outlet weight fraction is 0.00040 acetic acid in benzene. Assume total flow rates are constant, water and benzene are completely immiscible, eqilibrium is linear.

K=y/x = wt. fraction solute in extract/wt. fraction solute in raffinate = 30.488

Determine the weight fraction of acetic acid in the water and the required number of stages.

A model centrifugal pump with impeller diameter 365 mm is tested at its design operating condition. The test gives the following data when pumping water, speed = 870 rev/min head = 18.9 m capacity = 73.7 L/s efficiency = 89%.

A geometrically similar pump is to be designed to pump a fluid with relative density 0.78 against a head of 85 m with a flow of 450 L/s.

Determine:

A) The impeller size?

B) The speed?

C) The power input at the design point of the prototype pump?

To show how the R^4 dependence of the Poiseuille law affects flow rate, calculate the bulk fllow through a 12 in. long fire hose nozzle with an inner diameter of 2 in. delivering water with n= 0.01 = 0.01 poise from a pressue of 100 psi and exiting to a pressure 14.7 psi. Assume there is a pump which can provide the necessary volume and give the answer in gallons/min. Please show work. Thanks!