In: Mechanical Engineering

Hydrogen at 25oC and 0.1 Mpa is fed to the head of a cutting torch. Calculate the adiabatic flame temperature if the hydrogen is burned with 256% excess air at at 25oC and 0.1 Mpa,

a) without taking into account dissociation

b) assuming equilibrium composition of water has been achieved (both dissociation reactions of water reach chemical equilibrium)

Hydrogen at 25oC and 0.1 Mpa is fed to the head of a
cutting torch. Calculate the adiabatic flame temperature if the
hydrogen is burned with 250% excess air at at 25oC and
0.1 Mpa,
a) without taking into account dissociation
b) assuming equilibrium composition of water has been achieved
(both dissociation reactions of water reach chemical
equilibrium)

determine the speed of sound in refrigerant-134a at 0.1 MPa and
60°C

Calculate pH of 0.1 M potassium hydrogen oxalate.
pKa1=1.25, pKa2=4.27.
Calculate pH of solution prepared from 0.1 mole of formic acid
and 0.02 mole of NaOH diluted to 1L. pKa=3.75.
You have 100 mL of 1 M ammonia solution (pKa=9.25).
What volume of 1 M hydrochloric acid is needed to prepare buffer
with pH=9.5?
What will be pH of a 100 mL buffer solution containing 0.064 M
of acetic acid and 0.036 M of sodium acetate, after addition of 1...

4) Calculate [H+] of a 0.135M HOCl solution at 25oC.

Two kilograms of steam initially at 200 degrees Celsius and 0.1
MPa are to be reversibly and adiabatically compressed to 10 bar.
Determine the final temperature and the work required.

Which of these has the lower concentration of hydrogen ions: 0.1
M H2SO4, 0.1 M HCl, CaCO3, or pure water?

Consider a rigid, thick-walled tube that is filled with H2O
liquid and vapor at 0.1 MPa. After it is sealed, it is heated so
that it passes through its critical point. What fraction of the
mass in the tube is liquid?

0.5 kg of a gas at temperature t1=20?C and pressure
p1=0.1 MPa was contained in a cylinder with a piston.
The gas was compressed (polytropic process) and a ratio of heat
exchanged during the process to the work of compression was ¼. Find
the final temperature and pressure of the gas if 15 KJ of heat was
transferred to the surroundings. Specific heats at constant volume
and pressure were 654.67 J/Kg/K and 897.64 J/kg/K,
respectively.

1) In an air-standard Brayton cycle, the air enters the
compressor at 0.1 MPa and 15?C. The pressure leaving the compressor
is 1.0 MPa, and the maximum temperature in the cycle is 1100?C.
Determine The pressure and temperature at each point in the cycle.
The compressor work, turbine work, and cycle efficiency. For each
control volume analysed, the model is ideal gas with constant
specific heat at 300 K, and each process is steady state with no
kinetic or potential...

Thermodynamics
1.
Correct Answer:
8.0087 ± 0.1%
Steam at 1 MPa, 593.2oC,
expands in a turbine to 0.01 MPa. If the process is
isentropic, find the specific entropy (kJ/kg-K) at the exit of
the turbine.
Note: Give your answer to
four decimal places.
2. Correct
Answer: 301.43
± 0.08%
Initially, an insulated rigid tank contains 19.37 kg of water at
27.04oC
and 101 kPa. The tank also contains a 4.42 kg copper block at
87.13oC.
Assume constant specific heats where Cwater...

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