Example 4:

Calculate the equilibrium composition if argon gas is heated in an are to 10000 K, 1 kPa assuming the plasma to consist of A, A⁺, the equilibrium constant of the reaction at this temp is 0.00042

Solution

 

Now

..............................................(1)
At T=10000K, p=1kpa
K=0.00042
Substituting the above in 1, we get


The composition is

Example 5:

The combustion chamber of a gas turbine used a liquid hydrocarbon fuel which has an approximate compostion of C₈H₁₈. On test the following data are obtained.

Tair = 400 K	Tproduct = 1000 K
Vair = 100 m/s	Vproduct = 150 m/s
Tfuel = 50° C	FAactual = 0.0211 kgfuel/kgair

Calculate the combustion efficiency.

Solution

For the ideal chemical reaction, the heat transfer is zero. Therefore, writing the first law for a control volume that includes the combustion chamber, we have,