Calculating Carbon Dioxide Output for Combustion Products: Mass & Volume

In summary, to calculate the carbon dioxide output per unit mass and volume for combustion products, the enthalpy of combustion is first calculated using the balanced equation. Then, the energy output per unit mass and volume is determined using the molar mass and mass density of carbon dioxide. The CO2 output per unit mass is -802.34 kj/mol divided by 44g/mol which equals 66.86 kj/g. The CO2 output per unit volume is calculated by multiplying the CO2 output per mass by the CH4 mass density, resulting in 43124.7 kj/m3. These calculations assume stoichiometric conditions and can be adjusted accordingly for different scenarios.
  • #1
mojo4king
10
0
Carbon dioxide output??

How would you go about calculating the carbon dioxide output per unit mass and volume for combustion products, i have already calculated the energy outputs per unit mass and volume.

Many thanks.
 
Physics news on Phys.org
  • #2
Pick an example and show us what you would try.
 
  • #3
for eg. combustion of CH4:
CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(l)

enthalpy of combustion: (-393.51) + 2(-241.82) - (-74.81) = -802.34 kj/mol

energy output per unit mass:
802.34 x 1000/16(molar mass) = -50146.25 kj/kg

energy output per unit volume:
-50146.25 x 0.645(mass density) = -32344.33 kj/m3

However I have no clue on how to calculate the carbon dioxide output per unit mass and volume, any help would be kindly appreciated.
Many thanks.
 
  • #4
From the balanced equation, 1 mole of CH4 makes 1 mole of CO2. How much does a mole of CH4 weigh? What about a mole of CO2? And, at STP, what volume does a mole of (ideal) gas occupy.
 
  • #5
1 mole of CO2= 44g
1 mole of CH4= 16g
At STP the volume of an ideal gas occupies 0.0224 m3...
 
  • #6
for eg. combustion of CH4:
CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(l)

enthalpy of combustion: (-393.51) + 2(-241.82) - (-74.81) = -802.34 kj/mol

energy output per unit mass:
802.34 x 1000/16(molar mass) = -50146.25 kj/kg

energy output per unit volume:
-50146.25 x 0.645(mass density) = -32344.33 kj/m3

1 mole of CO2= 44g
1 mole of CH4= 16g
At STP the volume of an ideal gas occupies 0.0224 m3...

the CO2 energy output per mass...
-802.34 kj/mol divided by 12 g/mol equals 66.86 kj/g

am i doing the right thing, and how would you calculate the CO2 output per unit volume?

Many thanks.
 
  • #7
-802.34 kj/mol divided by 12 g/mol equals 66.86 kj/g
CORRECTION: DIVIDED BY 16G/MOL
 
  • #8
mojo4king said:
1 mole of CO2= 44g
1 mole of CH4= 16g
At STP the volume of an ideal gas occupies 0.0224 m3...
So, the CO2 output (assuming stoichiometric conditions) is:
44g of CO2 per mole of CH4
OR
2.75g of CO2 per g of CH4
OR
1 liter of CO2 per liter of CH4...etc.
 
  • #9
however i need to work out the CO2 output per unit mass and volume,
the units would be kj/kg and kj/m3,correct?

the CO2 energy output per mass...
-802.34 kj/mol divided by 12 g/mol equals 66860 kj/kg

the CO2 energy output per unit volume:
66860 x 0.645 (CH4 mass density)= 43124.7 kj/m3

Have i done these calculations properly?
Thanks.
 

1. What is carbon dioxide output?

Carbon dioxide output refers to the amount of carbon dioxide that is released into the atmosphere as a result of human activities, such as burning fossil fuels or deforestation.

2. Why is carbon dioxide output important?

Carbon dioxide output is important because it is a major contributor to climate change. The excess carbon dioxide in the atmosphere traps heat and contributes to rising global temperatures, leading to various environmental and societal impacts.

3. How is carbon dioxide output measured?

Carbon dioxide output is typically measured in metric tons per year. This measurement is based on the amount of carbon dioxide that is emitted by various sources, such as power plants, factories, and transportation, over a specific period of time.

4. What are the main sources of carbon dioxide output?

The main sources of carbon dioxide output are the burning of fossil fuels, such as coal, oil, and natural gas, for energy production, transportation, and industrial processes. Land-use changes, such as deforestation, also contribute to carbon dioxide output.

5. How can we reduce carbon dioxide output?

There are various ways to reduce carbon dioxide output, such as transitioning to renewable energy sources, improving energy efficiency, implementing sustainable land-use practices, and promoting carbon capture and storage technologies. Additionally, individuals can reduce their carbon footprint by making small changes in their daily habits, such as using public transportation, reducing energy consumption, and supporting sustainable businesses.

Similar threads

  • Biology and Medical
Replies
16
Views
1K
Replies
5
Views
2K
Replies
10
Views
2K
Replies
3
Views
868
  • Biology and Chemistry Homework Help
Replies
16
Views
3K
  • Mechanical Engineering
Replies
2
Views
88
  • Biology and Chemistry Homework Help
Replies
8
Views
2K
  • Biology and Chemistry Homework Help
Replies
6
Views
6K
Replies
5
Views
1K
Back
Top