Mole Concept Q: Volume of 5.25g Nitrogen @ 26\circ C, 74.2 cm

  • Context: Chemistry 
  • Thread starter Thread starter Saitama
  • Start date Start date
  • Tags Tags
    Concept Mole
Click For Summary

Discussion Overview

The discussion revolves around a homework problem involving the mole concept, specifically calculating the volume occupied by 5.25g of nitrogen gas at a temperature of 26°C and a pressure of 74.2 cm. The scope includes theoretical application of gas laws and ideal gas equations.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant expresses confusion about how to start solving the problem, noting their experience with STP conditions but not with the given conditions.
  • Another participant suggests using the ideal gas equation, PV=nRT, but raises a question about the pressure unit, wondering if it is cm or cm Hg.
  • A subsequent reply clarifies that cm Hg is the likely unit, relating it to mmHg or torr.
  • There is a discussion about whether the original poster can post additional questions in the same thread, with mixed advice on the appropriateness of doing so.

Areas of Agreement / Disagreement

Participants generally agree on the use of the ideal gas equation but have not reached a consensus on the correct interpretation of the pressure unit. The original poster's uncertainty about how to proceed with the problem remains unresolved.

Contextual Notes

There is ambiguity regarding the pressure unit (cm vs. cm Hg), which could affect the calculations. The original poster's familiarity with STP conditions may limit their ability to apply the ideal gas law in this context.

Who May Find This Useful

Students working on gas laws and the mole concept, particularly those encountering similar problems involving non-STP conditions.

Saitama
Messages
4,244
Reaction score
93

Homework Statement


Hello Everyone!
I am solving a lots and lots of questions on Mole Concept but i am getting stuck in this:-

Calculate the volume occupied by 5.25g of nitrogen at 26\circ C and 74.2 cm of pressure.

The Attempt at a Solution


I actually don't know from where should i start. I have done questions when the conditions are at STP but i have never done a question like this.

Thanks! :smile:
 
Physics news on Phys.org
start by the fact that one mole of any gas at 273K and 1 bar pressure occupies 22.7L volume
 
piyushkumar said:
start by the fact that one mole of any gas at 273K and 1 bar pressure occupies 22.7L volume

Thanks for your reply Piyush!
I thought of starting by this but i am not able to think of the next step. :confused:
 
This is direct application of ideal gas equation, PV=nRT. The only problem is with units of the pressure - is it cm (which doesn't make sense to me), or cm Hg?
 
Borek said:
This is direct application of ideal gas equation, PV=nRT. The only problem is with units of the pressure - is it cm (which doesn't make sense to me), or cm Hg?

So what should be the unit? :confused:
 
cm Hg most likely. Close relative of mmHg, or torr.
 
Borek said:
cm Hg most likely. Close relative of mmHg, or torr.

Thanks for your help Borek! :smile:

I am having many questions to solve in mole concept (almost a full book). If i get any doubts, can i post them in this thread one by one? :smile:
 
In general you should start a new thread with each one. But there is a catch - if you start several at once, that's wrong as well.

Let's hope you will be able to deal with most of the questions on your own :wink:
 
Borek said:
In general you should start a new thread with each one. But there is a catch - if you start several at once, that's wrong as well.

Let's hope you will be able to deal with most of the questions on your own :wink:

Yes i will try to solve them by my own :wink:
But they are really tough...:rolleyes:
 

Similar threads

Chemistry Calculating Moles of O2 Gas at Pressure & Volume
  • · Replies 3 ·
Replies
3
Views
2K
Chemistry Basic Mole Concept Questions, Grade 11 Chem
  • · Replies 6 ·
Replies
6
Views
36K
Chemistry: Could We Do Without the Mole Concept?
  • · Replies 1 ·
Replies
1
Views
2K
What Volume of Oxygen Gas is Needed to Combust 3.5 Moles of Propane?
  • · Replies 5 ·
Replies
5
Views
3K
Chemistry Chemistry - Calculating moles, mass and percentages
  • · Replies 8 ·
Replies
8
Views
21K
Predicting Remaining Pressure in Compressed Gas Cylinder
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Regarding root mean square velocity
  • · Replies 7 ·
Replies
7
Views
4K
Total force from air spring model (double acting piston)
  • · Replies 8 ·
Replies
8
Views
3K
How Much Solvent is Used in Moles for a Reaction in a Closed Vessel at 80°C?
  • · Replies 1 ·
Replies
1
Views
4K
Physical Chemistry- Partial Pressures
  • · Replies 3 ·
Replies
3
Views
5K