Mean molar mass after combustion in a combustion engine

In summary, the task at hand is to calculate the mean molar mass of a reaction in a combustion engine involving C4H10, N2, O2, H2O, CO2, and N2 molecules with given molar masses. The mass of air and fuel in the cylinder before combustion is also provided. The solution involves balancing the reaction equation and dividing the right hand side by the amount of molecules to obtain the mean molar mass. However, the correct answer has not been achieved and further assistance is requested.
  • #1
ChristopherJ
5
0

Homework Statement


The problem is to calculate the mean molar mass of the reaktion below, which takes place in a combustion engine.

C4H10 + z(0.79N2 + 0.21O2) → αH2O + βCO2 + γN2

where the molar masses for the different molecules/atoms are:
MH2O = 18, MCO2 = 44, MN2 = 28, MO2 = 32, MC = 12, MH = 1.

The mass of the air in the cylinder before combustion is 2.39905 grams. The mass of the fuel in the cylinder is 45.0 milligrams.

Homework Equations


See above


The Attempt at a Solution


I have tried to balance the equation above by calculating the amount of molecules of oxygen and nitrogen in the cylinder and the amount of molecules in the fuel to get α, β and γ. And then use these values to balance the reaction equation above. The mean molar mass can be calculated by dividing the right hand side by the amount of molecules at hand.

But, I don't get the right answer by doing this. Can anyone help me with this?

I am very grateful for answers!

Best regards
Christopher
 
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  • #2
Without showing your calculations, you won't get much help.
 

1. What is the purpose of calculating mean molar mass after combustion in a combustion engine?

The mean molar mass after combustion in a combustion engine is a measure of the average mass of all the molecules in the fuel that has been burned. This information is important for understanding the efficiency and performance of the engine.

2. How is mean molar mass after combustion calculated?

Mean molar mass after combustion is calculated by dividing the total mass of the fuel burned by the total number of moles of fuel that were present. This can also be calculated by multiplying the molar mass of each individual component in the fuel by its mole fraction, and then summing these values together.

3. What factors can affect the mean molar mass after combustion in a combustion engine?

The mean molar mass after combustion can be affected by the type of fuel used, the composition of the fuel, and the combustion process itself. Other factors such as temperature, pressure, and the presence of catalysts can also influence the resulting molar mass.

4. How does the mean molar mass after combustion impact engine performance?

The mean molar mass after combustion can impact engine performance by affecting the energy released during combustion. A higher molar mass means that more energy is released, resulting in a more powerful and efficient engine. Additionally, a lower molar mass can lead to a leaner fuel-air mixture, which can improve fuel economy.

5. How is mean molar mass after combustion used in the development of new engine technologies?

Mean molar mass after combustion is an important factor in the development of new engine technologies, as it can help engineers optimize fuel composition and combustion processes for improved efficiency and performance. It is also used in the testing and validation of new fuels and engine designs to ensure they meet regulatory standards.

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