Acetylene gas (C2H2) at 25°C is burned during a steady-flow combustion process with 30 percent excess air at 27°C. It is observed that 75,000 kJ of heat is being lost from the combustion chamber to the surroundings per kmol of acetylene. Assuming combustion is complete, determine the exit temperature of the product gases.

Final answer should be TP = 2062.1 K

Explanation:

Assumptions:

Combustion is complete.

Air and combustion gases are ideal gases.

Kinetic and  potential energies are negligible.

There are no work interactions.

Analysis:

The fuel is burned completely with the excess air, and thus the products will contain only CO2,  H2O, N2, and some free O2. Considering 1 kmol of C2H2, the combustion equation can be written as:

(the rest of the solution is attached)

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only

answer:

the answer is d

explanation: