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Topic: Completing equation  (Read 6213 times)

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Kitty Kat

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Completing equation
« on: October 18, 2004, 07:57:15 AM »
Does any1 know how to complete this equation?
FeS + Cu2S + O2 -->

Offline AWK

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Re:Completing equation
« Reply #1 on: October 18, 2004, 08:26:21 AM »
Depending on temperature and amount of oxygen you can obtain Fe2O3 and Cu2O or Fe3O4 and CuO.
Do reaction separately, eg
4FeS + 7O2 = 2Fe2O3 + 4SO2
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Offline Donaldson Tan

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Re:Completing equation
« Reply #2 on: October 20, 2004, 03:25:48 PM »
Cu2S + 2O2 -> 2CuO + SO2
« Last Edit: October 20, 2004, 03:26:20 PM by geodome »
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Tetrahedrite

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Re:Completing equation
« Reply #3 on: October 20, 2004, 09:01:40 PM »
Both of you are almost right!

2FeS + Cu2S + 7O2 -> Fe2O3 + 2CuO + 3SO3

Cuprite (Cu2O), magnetite (Fe3O4) and SO2 are unlikely to form in the presence of sufficient oxygen

Offline AWK

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Re:Completing equation
« Reply #4 on: October 21, 2004, 01:06:13 AM »
Reaction wrote down by Tetrahedrite is only valid for 1:1 molar mixture of FeS and Cu2S and SO2 not SO3 is produced in this way. To convert SO2 to SO3  a catalyst is needed.
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Tetrahedrite

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Re:Completing equation
« Reply #5 on: October 21, 2004, 02:18:27 AM »
At high enough temperature no catalyst is required! We can safely assume a reaction such as this is not occurring at room temperature otherwise base metal mines all around the world would start catching fire! In the presence of the atmosphere in this case the thermodynamically stable species are CuO (tenorite), Fe2O3 (hematite, with time) SO2 at the earth's surface is unstable and will eventually be converted to sulfate and incorporated into the soil as a soluble salt.

Offline AWK

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Re:Completing equation
« Reply #6 on: October 22, 2004, 12:58:16 AM »
At high enough temperature no catalyst is required!
If so, why SO3 is produced from FeS2 in two steps
4FeS2 + 11O2 = Fe2O3 + 8SO2
and
2SO2 + O2 =SO3
AWK

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