How to Calculate the Number of Moles in a Gas Using the Ideal Gas Law?

  • Thread starter Thread starter smashtheball
  • Start date Start date
  • Tags Tags
    Moles
AI Thread Summary
To calculate the number of moles of gas in a 7.71-liter vessel at 18.6°C and 8.35 atm, the Ideal Gas Law (PV=nRT) should be applied. The volume, temperature, and pressure are provided, but the molecular mass is not needed for this calculation. Instead, the gas constant (R) and the appropriate units must be used to solve for 'n', the number of moles. The discussion emphasizes the importance of recognizing the Ideal Gas Law as the correct formula for this scenario. Understanding this law is crucial for accurately determining the number of moles in a gas under specified conditions.
smashtheball
Messages
2
Reaction score
0

Homework Statement


Gas is contained in an 7.71 liter vessel at a temperature of 18.6oC and a pressure of 8.35 atm. Determine the number of moles of gas in the vessel.


Homework Equations



1 mol= 6.03 x 10^23

# of moles= mass of the gas/molecular mass

The Attempt at a Solution



I converted Liters to grams, which would make it 7,710 grams, but I'm not sure how to find the molecular mass of the gas, when just given the temperature and the pressure.
 
Physics news on Phys.org
welcome to PF!

Right now you have a volume, a temperature, and a pressure, and you want to find number of moles. is it possible that you are overseeing a formula?
 
oh, the Ideal gas law!
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

What Is the Best Method to Calculate Gas Flow Through an Orifice?
Replies
5
Views
3K
Ideal Gas Law and Pressure at 80°C
Replies
2
Views
3K
Calculations using the Ideal Gas Law
Replies
2
Views
2K
Calculate Temperature of Nitrogen Gas at 2 atm Pressure
Replies
7
Views
1K
What would be a real-life example of the ideal gas law?
Replies
3
Views
9K
Calculating ΔE Difference for 2 Samples of Monatomic Ideal Gas
Replies
4
Views
2K
What is the molar heat capacity of an ideal gas at constant pressure and volume?
Replies
5
Views
3K
Heat and work when temperature increases by 1 degree
Replies
21
Views
3K
Proof question related to the Ideal Gas Law
Replies
8
Views
2K
Calculating Entropy Change for Gas Sample with Helium and Ideal Gas Equation
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top