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  #1  
Old 12-16-2005, 04:54 PM
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Exclamation Stoichiometry Nightmare!

Hey can you help me solve problems dealing with stp and find the air? And doing a multistep conversion when i have to find the grams and do the process.
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Old 12-16-2005, 05:05 PM
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Default ummmmmmmmm.

What are the problems?
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Old 12-17-2005, 07:48 AM
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Exclamation stoichiometry questions.

the problem is if i burned 4.0x10^24 molecules of methane (CH4) what mass of methane did i burn. it gives me the answer but i have to do the process of finding the answer. The answer is 110g but i dont know how they get it.

2.) A room with a volume of 4000 L conains how many molecules of air at STP? The answer is 178.6 molecules of air but how do u get the answer.
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Old 12-28-2005, 01:31 PM
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1) for this, you have to first find the volume of 1 mole of methane by adding the molar mass of each of the elements in the formula (H=1 C=12.01) so CH4 = 12.01+4, so 1 mole or 6.02x10^23 particles of CH4 weighs 16.01 grams. after that, im not so sure. but i hoped that helped.
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Old 12-29-2005, 02:09 PM
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Default RE:Stoichiometry Nightmare!!

Yes it did thank you very much.
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Old 01-04-2006, 11:56 AM
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Talking I have a question..

what is stoichiometry? Is it a type of math?
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Old 01-04-2006, 01:52 PM
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Exclamation

no, it is a type of science dealing with moles(the unit, not the thing on your face). here is a sample question:

sodium reacts with oxygen to produce sodium oxide.
4Na(s) + O2(g) --> 2Na2O(s)

a) how many grams of Na20 are produced when 2.5 moles of Na react?
b)If you have 18g of Na, how many grams of O2 are required for a reaction?
c)How many grams of O2 are needed in a reaction that produces 75 grams of Na2O?



As you can see, its hard!!

try to figure it out. ill post the anwsers soon

Last edited by theBman; 01-04-2006 at 05:08 PM.. Reason: i wanted to put some smilies in
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Old 01-10-2006, 02:20 PM
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come on, no guesses?
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Old 01-12-2006, 08:30 PM
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Default

before you get into that, how about you understand what a mole is...

A mole is a standard of measurement for elements, because saying I have one pound/gram of carbon is very inexact and not very useful. So the scientific community uses the term mole. If the atomic mass of an element is x amu, then one mole of that element is x grams.
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Old 01-15-2006, 11:17 AM
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Default big number...

oh, and BTW, 1 mole is equal to 6.02 x 10^23. that's 602 000 000 000 000 000 000 000 000!!! that is also six hundred 2 trillion trillion!!!
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