How Do Dalton's Laws Help Calculate HCl Volume Needed in a Chemical Reaction?

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Discussion Overview

The discussion revolves around a homework problem involving the calculation of the volume of hydrochloric acid (HCl) needed for a chemical reaction producing hydrogen gas. Participants explore the application of Dalton's laws and the ideal gas equation in the context of stoichiometry and gas collection over water.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents a chemical reaction and asks for guidance on how to start solving the problem, specifically regarding the volume of HCl needed.
  • Another participant suggests calculating the number of moles of gas collected and using that to determine the moles of HCl required, followed by calculating the volume of the HCl solution.
  • A different participant expresses confusion about how to find the number of moles of gas collected without initial quantities being provided, indicating a struggle with the problem's requirements.
  • One reply emphasizes the importance of the ideal gas equation as a critical component for solving the problem.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are differing levels of understanding regarding the application of gas laws and the information needed to solve the problem.

Contextual Notes

Participants highlight potential missing information, such as initial quantities of reactants and the need for assumptions regarding gas behavior under the given conditions.

Who May Find This Useful

Students working on stoichiometry and gas law applications in chemistry, particularly those struggling with similar homework problems involving chemical reactions and gas collection.

jackjones12
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Homework Statement


Given the following chemical reaction:
Zn + HCl ----> ZnCl2 + H2(g)

If you measured the total volume of collected gas over water at 20 Celsius to be 428 ml at a total pressure of 845 torr, how many milliliters of 2.6M HCl would be required to produce the correct amount of Hydrogen?

Homework Equations


Dalton's Laws

The Attempt at a Solution


Im not asking for a complete answer here just need help starting, I can't seem to even get how to begin this problem. Any information will be appreciated, thanks.
 
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How many moles of gas were collected?

Can you use this number of moles to calculate moles of HCl necessary? Then volume of solution that contains these moles?
 
How can i find out how many moles I collected if i wasnt even given how many i started of with. I am sorry to sound dumb but I am having a difficult with this. It might be that I am just missing something really small.
 
You are missing something something really big. It is called ideal gas equation.
 

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