What is the partial pressure of the NH3

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Discussion Overview

The discussion revolves around calculating the partial pressure of ammonia (NH3) in a mixture of gases, given the total pressure and the masses of the gases involved. The context is a homework problem related to the application of Dalton's Law of Partial Pressure and the ideal gas law.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant states the combined pressure of the gases and seeks help in calculating the partial pressure of NH3.
  • Another participant suggests using the mole fraction of NH3 multiplied by the total pressure to find the partial pressure.
  • A subsequent participant confirms the method by stating that the moles of NH3 should be divided by the total number of moles and then multiplied by the total pressure.
  • A later reply agrees with the method proposed, affirming its correctness.
  • One participant expresses gratitude for the assistance received.

Areas of Agreement / Disagreement

Participants generally agree on the method to calculate the partial pressure of NH3, with no significant disagreement noted in the proposed approach.

Contextual Notes

Participants have not detailed the specific calculations or assumptions regarding the conversion of grams to moles, nor have they addressed any potential limitations of the ideal gas law in this context.

DallasMavs
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Homework Statement


The combined pressure of 32.0 g of CH4, 64.2 g NH3, and 100 g of CO2 is 9.42 atm. What is the partial pressure of the NH3



Homework Equations


Dalton's Law of Partial Pressure = P=Pa +Pb + Pc ...
The individual partial pressure follow the ideal gas law. For component A, (Pa)V=(nA)RT where nA is the number of oles in component A

The Attempt at a Solution


I have converted all the grams to moles by dividing the grams by the compounds molar mass. I have no idea what to do from there. Someone please help.
 
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Partial pressure of any gas is its molefraction * total pressure.
so, for your problem it is

\frac{n_{NH_3}}{n_{total}}.(9.42)
 
So, I would take the moles of NH3 and divide that by the total number of moles (moles of NH3, CH4, and CO2). Than multiply that by the total pressure. Is that correct?
 
DallasMavs said:
So, I would take the moles of NH3 and divide that by the total number of moles (moles of NH3, CH4, and CO2). Than multiply that by the total pressure. Is that correct?
yes that's it
 
Thanks for the assistance
 

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