gonif86
Harmless
Posts: 4
Registered: 31-7-2004
Member Is Offline
Mood: No Mood
|
|
Stoichiometric Fuel Air Explosions and decibles
High school chem class teacher showed 2 parts hydrogen and 1 part oxygen with a nice bang .
What confuses me is what ratio gas to air forms a stoichiometric balanced equation.
Propane
C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)
What about
C3H8(g)+Air →3CO2(g)+4H2O(g)
Can I use a formula to get predicted explosion decibels. I am making a carbide cannon like device
Thank you
|
|
|
njl
National Hazard
Posts: 609
Registered: 26-11-2019
Location: under the sycamore tree
Member Is Offline
Mood: ambivalent
|
|
Probably no. Accurately predicting something like sound intensity would require several variables to be controlled. You would need to know and control
fuel composition, air composition, fuel/air ratio, compression ratio, container volume, pressure, material and mass etc... not trivial. If you're ok
with a rough approximation that doesn't really mean much you can approximate from the energy released during the reaction.
Reflux condenser?? I barely know her!
|
|
|
Maurice-VD-3
Harmless
Posts: 10
Registered: 14-11-2018
Member Is Offline
|
|
If 1 mole propane needs 5 moles O2 to be completely oxidized, one liter propane reacts with 5 liters oxygen O2. And this combustion is made in air, it
needs 5 times more air, as air contains only 20% oxygen. So one liter propane requires 25 liters air to be completely oxidized. You may write the
equation in air :
C3H8 + 5 O2 + 20 N2 -> 3 CO2 + 4 H2O + 20 N2
|
|
|
gonif86
Harmless
Posts: 4
Registered: 31-7-2004
Member Is Offline
Mood: No Mood
|
|
Thank you for the help.
My experiment worked
Applying chemistry principles I built a safe sound cannon that works great with Calcium Carbide, propane and other gases .
Kids love it. No need for firecrackers that are illegal where I live or homemade M80's
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
