Reaction of gases/ gas stoichiometry

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Discussion Overview

The discussion revolves around gas stoichiometry and the reactions of gases, specifically focusing on the volumes of reactants and products in chemical reactions. Participants explore the implications of Avogadro's Law and limiting reagents in the context of given gas volumes at constant temperature and pressure.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Conceptual clarification

Main Points Raised

  • One participant presents a homework problem involving the reaction of 50 mL of H2 and 50 mL of N2, questioning how many mL of NH3 will be produced based on the stoichiometric equation 3H2 + N2 → 2NH3.
  • Another participant suggests that the problem is a simple limiting reagent scenario, noting that volumes can be treated similarly to moles in this context.
  • A different participant raises a question about a second reaction involving chlorine gas and ethylene, expressing confusion over why the product volume is 50 mL instead of the expected 100 mL, given equal volumes of reactants.
  • A subsequent reply prompts the participant to consider the total moles on each side of the reaction equation to clarify the discrepancy in expected product volume.

Areas of Agreement / Disagreement

Participants generally agree on the application of gas volume ratios and limiting reagents, but there is a lack of consensus regarding the reasoning behind the product volume in the chlorine and ethylene reaction, indicating some confusion and differing interpretations.

Contextual Notes

Participants have not fully resolved the assumptions regarding the stoichiometry of the second reaction, particularly how the total moles of reactants relate to the product volume.

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Homework Statement


The reaction of 50 mL of H2 gas and 50 mL of N2 gas via the equation: 3H2 + N2 ---> 2NH3 will produce how many mL of product? A reaction of 25 mL of Hydrogen gas and 75 mL of Nitrogen gas? Assume that temperature and pressure are constant.


Homework Equations


Avogadro's Law


The Attempt at a Solution


I know that Volume of gases at STP are proportional to the moles of gas present, so the ratios are 3:1:2, and that i mole of ideal gas is 22.4 L. I'm not totally sure as to where to go from here. Is it kind of a limiting reagent because they give me the volumes of each reactant? Please help. Thanks!
 
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It is just a simple limiting reagent, with volumes instead of moles - but, as you have already mentioned, in this case moles and volume can be used interchangeably.
 
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Okay thank you. Well, I asked this question because of this problem: The reaction of 50 mL of chlorine gas with 50 mL of Ethylene gas Cl2 (g) + C2H4 (g) = C2H4Cl2 (g). How many mL of product will be produced? The answer is 50mL but I don't understand why. Since there is 50 mL of chorine and 50 mL of ethylene, shouldn't there be 100 mL of product? But instead, the answer is just 50 mL...
 
Take a look at the reaction equation. How many moles (total) on the left? How many moles on the right?
 
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