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Homework Help: Carbon Dioxide as an ideal gas

  1. Jul 6, 2011 #1
    1. The problem statement, all variables and given/known data
    If carbon dioxide is collected at 104.3 kPa and 29.6 oC, how many grams are collected? Use the gas constant of 0.08206 L. atm/mol . K.

    1. Liters at STP.
    2. Grams at new temperature and pressure.

    2. Relevant equations

    3. The attempt at a solution
    I really don't understand what the problem wants me to do, there's not enough info to use PV=nRT equation and I don't know any other ideal gas ones except for the Combined Gas Law Equation which is also not applicable. Perhaps it has something to do with the earlier part of the problem which is all here: http://www.duluthhigh.org/tpindexy.php?page=myhome&id=104 [Broken] but it doesn't seem to. I solved 1-5 but with 6 and 7 I really have no clue and this is a summer assignment so we really haven't learned anything yet. Any help is appreciated. Thanks.
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jul 7, 2011 #2


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    Gold Member

    It sounds to me that it does depend on the previous questions. You found the molecular formula of the unknown hydrocarbon in question 2, and then are told that "53.21 L of the substance burns in 84.31 L of oxygen". You can write a chemical equation for the combustion and use the volumes of the limiting reagent to find how much carbon dioxide is produced.
  4. Jul 8, 2011 #3
    Thanks, I was able to figure it out that way.
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