I am still not quite grasping how to complete this problem:
Posted by K on Sunday, October 14, 2007 at 6:43pm.
Many home barbeques are fueled with propane gas C3H8.
What mass of carbon dioxide (in kg) is produced upon the complete combustion of 18.9L of propane (approximate contents of one 5-gallon tank)? Assume that the density of the liquid propane in the tank is 0.621g/ml.
How do I start & work this question?
I wrote a balanced equation:
C3H8 + 5O2 -> 4H2O + 3CO2
Now, where do I go from here?
For Further Reading
CHEM - bobpursley, Sunday, October 14, 2007 at 7:08pm
The propane is liquid. Determine the mass from the volume and liquid. Convert that mass to moles.
For each mole of propane, you get (from the balanced equation) three times as much CO2. Convert moles of carbon dioxide to kg
---from my balanced equation I have:
C3H8 = 44g/mol
5O2 = 160g/mol
4H2O = 72g/mol
3CO2 = 130g/mol
The density of the liquid propane = 0.621g/mL.
The original amount of propane is 18.9L.
The problem looks simple enough, but I still cannot get it correct. Please help.
Reread my post. You have not figured the moles of propane, the first thing I suggested.
moles propane=masspropane/molmassPropane
=desity*volume/44
does this sound correct?
8.00X10^-4 kg?
No, I don't think so. Follow the instructions Bob Pursley gave and show your work.
1.55 x 10^9
To solve this problem, you need to follow a systematic approach. Here are the steps you can take:
1. Determine the mass of propane based on the given volume and density:
Mass = Volume x Density
Convert the volume from liters to milliliters (1 L = 1000 mL) and then multiply by the density (0.621 g/mL). This will give you the mass of propane in grams (g).
2. Convert the mass of propane to moles:
Use the molar mass of propane (C3H8), which is 44 g/mol, to convert the mass of propane to moles. Divide the mass of propane by the molar mass to get the moles of propane.
3. Use the balanced equation and stoichiometry to find the moles of carbon dioxide (CO2) produced:
According to the balanced equation provided, for every mole of propane burned, you get 3 moles of CO2. Multiply the moles of propane by the mole ratio (3) to get the moles of CO2.
4. Convert the moles of carbon dioxide to kilograms:
Use the molar mass of carbon dioxide (CO2), which is 44 g/mol, to convert the moles of CO2 to grams. Then, divide by 1000 to convert grams to kilograms.
By following these steps, you should be able to find the mass of carbon dioxide produced upon the complete combustion of the given amount of propane. Make sure to perform all the necessary unit conversions and calculations accurately.