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malford
Hazard to Others
Posts: 116
Registered: 17-6-2013
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Quote: Originally posted by IndependentBoffin  | My thermochemistry is a bit rusty (last did the sums more than a decade ago) but here are the reaction calculations. Please feel free to correct me if
you spot a mistake.
Overall equation: 2Mg + (C<sub>2</sub>F<sub>4</sub> <sub>n</sub> -> 2MgF<sub>2</sub> + 2C
Mg + F<sub>2</sub> -> MgF<sub>2</sub> ................................ ΔH<sub>f</sub> = -1124 kJ/mole
2C + 2F<sub>2</sub> -> -(C<sub>2</sub>F<sub>4</sub><sub>n</sub>- ................................ ΔH<sub>f</sub> = -832.6kJ/mole
Heat of reaction = 832.6 - 2×1124 = -1416 kJ for 2 moles of Mg and 1 mole of (C<sub>2</sub>F<sub>4</sub><sub>n</sub>.
Because I am an engineer and tend to think in terms of specific energy this gives 1416/(2×12 + 4×19 + 2×24.31)kJ/g or 9.526 kJ/g of reactants.
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http://www.sciencemadness.org/talk/viewthread.php?tid=24980
As you can see in the chart, regular flash powder ranks high with -10.59 kJ/g, but more importantly for munitions -27.38 kJ/cm3. To slow
the reaction of flash powder, one can use dissolved nitrocellulose as a binder. This makes for a spectacular igniter.
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Zyklon-A
International Hazard
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Registered: 26-11-2013
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Mood: Fluorine radical
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I know this has been dead for a while, but I here is a good read on the subject:
Attachment: (MTV-1) Magnesium-Teflon-Viton Pyrotechnic Compositions.pdf (1.8MB)
This file has been downloaded 682 times
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