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The energy of an isolated system
a. is always decreasing
b. is always constant
c. is always increasing
d. none of the above
5. A water pump delivers 130 dm3/minute (0.13 m3/min) drawing it in at 100 kPa and delivering it at 500 kPa. Assuming that only flow energy changes occur, calculate the power supplied to the pump. (860 W)
Urea with formula structure of (NH2)2CO is diffusing very slowly in water solution at 31 oC to
develop the hydrolysis of urea into carbon dioxide and ammonia. The urea solution was produced
through the active site with the protein binding (MW = 726 300) containing 21 g protein/200 mL
solution and form a tetrahedral cluster that fills the cavity site through hydrogen bonds.Compare the diffusivity coefficient for urea solution at 31 oC using Stokes-Einstein and
Wilke-Chang methods.
A non-flow system receives 80 kJ of heat transfer and loses 20 kJ as work transfer. What is the change in the internal energy of the fluid?
The shaft of a steam turbine produces 600 Nm torque at 50 rev/s. Calculate the work transfer rate from the steam.
Find the equivalent spring constant of the system shown in figure below
Three springs with the same constant connected in series and parallel, and a 1-kg object attached at one end of a spring, as shown in figure below. Spring constant is k1 = k2 = k3 = 250 N/m. What is the change in length of the three springs? Acceleration due to gravity is g = 9.806 m.s-2
2A = 3R + S
Time (h)
0
0.5
1.5
3
4
7
13
Concentration of
A (mol/lt)
0.2
0.181
0.155
0.131
0.12
0.099
0.077
Determine:
A) The reaction order and the reaction rate coefficient
B) The time to react 90% conversion
C) If the activation energy is 10,800 kj/mol, calculate the half-life
time at 60 C.
2A = 3R + S
Time (h)
0
0.5
1.5
3
4
7
13
Concentration of
A (mol/lt)
0.2
0.181
0.155
0.131
0.12
0.099
0.077
Determine:
A) The reaction order and the reaction rate coefficient
B) The time to react 90% conversion
C) If the activation energy is 10,800 kj/mol, calculate the half-life
time at 60 C.
#340153 on Dec 2023