Chemical Engineering Answers

0.05 kg of steam at 10 bar, dryness fraction 0.84, is heated reversibly in a rigid vessel until the pressure is 20 bar. Calculate the change of entropy and the heat supplied.

Define Equilibrium

A Carnot engine receives 250 kJ/s of heat from a heat-source reservoir at 525degree Celcius and rejects heat to a heat-sink reservoir at 50degree Celcius.

1. What are the powers developed?

2. Calculate the heat rejected?

. If 60,000 kg of whole milk containing 4% fat is to be separated in a 6 hour period into skim milk with 0.4% fat and cream with 35% fat, what are the flow rates of the two output streams from a continuous centrifuge which accomplishes this separation? Basis: 1 hour's flow of whole milk.

Producer gas analyzing 25.3% CO, 13.2% H2, 0.4% CH4, 5.4% CO2, 0.5%O2, and 55.2% N2 is burned in excess air at 25°C,245 torrs and 60%RH.Partial orsat analysis of the stack gas shows 16.3% CO2, 1.79%CO and 0.72% H2. Calculate:
A. Percent Excess Air
B. Complete Orsat Analysis Of The Stack Gas .

The value of the second ionisation energy of calcium is 1150KJ.mol-1
Which equation correctly represent this statement?
A. Ca^+(g) = Ca^2+(g) + e^-
Delta = +1150KJ.mol-1
B. Ca(g) = Ca^2+(g) + 2^e^-
Delta = +1150KJ.mol-1
C. Ca^+(g) = Ca^2+(g) + e^-
Delta = -1150KJ.mol-1
D. Ca(g) = Ca^2+(g) + 2e^-
Delta = -1150KJ.mol-1

When copper os extracted from its ore, the metal is not pure enough for electrical uses. The impure copper, which contains small amount of silver and gold, is purified by electrolysis. During this process, a "sludge" forms beneath the anode, which is found to contain silver and traces of Gold. Why is the silver found in this sludge?
A. Silver reacts with electrolyte to form an insoluble sulphate salt.
B. Silver is more dense than copper and falls off the cathode
C. Silver reacts with electrolyte to form an insoluble chloride salt
D. Silver is less electropositive than copper

Cuprammonium ion [Cu(NH3)4]^2+ is?
A. Square planar
B. Tetrahedral
C. Octahedral
D. Triangular bipyramidal

Which one of the following has square planar geometry?
A. [Ag(NH3)2]^+
B. [Cu(en)2]^2+
C. [MnCl4]^2-
D. [Ni(CO)4]

In the complex compound K4[Ni(CN)4], what is the oxidation state of nickel?
A. -1
B. 0
C. +1
D. +2