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Topic: Gas stoichiometry Question  (Read 1559 times)

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Offline edsmart

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Gas stoichiometry Question
« on: September 16, 2018, 11:08:54 AM »
Consider the following reaction:

CH4(g) + 2O2(g)

 CO2(g) + 2H2O(l)

What is the final volume if 10 L of methane (CH4) reacts completely with 20 L of oxygen?

So for this question, I got 30 liters, but the question said it was 10 liters. Why is liquid not counted? When is liquid counted? How about solid? Does this only apply to volume?

Offline sjb

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Re: Gas stoichiometry Question
« Reply #1 on: September 16, 2018, 11:14:36 AM »
What is the volume of one mole of water at STP, and of one mole of carbon dioxide, also at STP?

Offline edsmart

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Re: Gas stoichiometry Question
« Reply #2 on: September 16, 2018, 11:44:09 AM »
22.4 L for water and 22.4 L for carbon dioxide, they are the same?

Offline sjb

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Re: Gas stoichiometry Question
« Reply #3 on: September 16, 2018, 11:50:15 AM »
Not quite, what is the definition of STP?

Offline edsmart

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Re: Gas stoichiometry Question
« Reply #4 on: September 16, 2018, 11:52:02 AM »
standard temperature and pressure, so 1atm and 273.15 K. I am not sure where to go

Offline chenbeier

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Re: Gas stoichiometry Question
« Reply #5 on: September 16, 2018, 12:31:39 PM »
And in which form is water  and Carbondioxide at STP

Offline edsmart

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Re: Gas stoichiometry Question
« Reply #6 on: September 16, 2018, 01:05:40 PM »
liquid and gas? I did the mass density for water to find the volume, i got like 18 ml.

Offline chenbeier

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Re: Gas stoichiometry Question
« Reply #7 on: September 16, 2018, 01:12:57 PM »
The volume what is counted for gas reaction is only the one of gaseous compounds. Liquid and solid substaces  are not counted.

Offline edsmart

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Re: Gas stoichiometry Question
« Reply #8 on: September 16, 2018, 01:15:05 PM »
Thank you, is it because gas is only applicable to ideal gas law?

Offline Borek

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Re: Gas stoichiometry Question
« Reply #9 on: September 16, 2018, 02:59:26 PM »
Thank you, is it because gas is only applicable to ideal gas law?

No idea what you mean, but you can apply ideal gas law only to gases, not to liquids nor solids.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline edsmart

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Re: Gas stoichiometry Question
« Reply #10 on: September 16, 2018, 03:04:04 PM »
ok thanks

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