Thermodynamics- Gauge pressure, moles, molecules

AI Thread Summary
To calculate the number of moles of oxygen gas in a 4.0 m^3 container at a gauge pressure of 8x10^5 Pa and 25 degrees Celsius, the ideal gas law is applied. The formula used is moles = (pressure x volume) / (R x temperature), resulting in 1292 moles. To find the number of molecules, Avogadro's number is multiplied by the moles, yielding approximately 7.78E26 molecules. The discussion also clarifies that gauge pressure is essential for determining the number of moles, as it directly influences the calculations. The problem was resolved successfully using the ideal gas law approach.
name_ask17
Messages
146
Reaction score
0

Homework Statement


A 4.0 m^3 container of oxygen gas has a gauge pressure of 8x10^5 Pa at 25 degrees c.
a) how many moles of oxy are present in the containe?r ANS: 1292 moles
b)how many oxy molecules are present? ANS: 7.78E26 oxy
(yes, i have the answers but i don't know how to get to them correcly.)

known:
oxy formula weight= 32

Homework Equations


moles=mass/formula weight
ALso, can you explain to me what gauge pressure has to do with moles.

The Attempt at a Solution


i tried to find how many moles by using the denisty of oxygen, but that doesn't work. please help. i am very confused

Nevermind. i got it(:
 
Last edited:
Physics news on Phys.org
moles = pressure x volume / R x temperatureR= 8.3144598moles= 8x10^5 Pa x 4 m^3 / 8.3144598 x 298.15 K= 1292 moles molecules= moles x 6.022E23 = 7.78E26 oxy molecules
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

Clarification on PV=nRT question.
Replies
6
Views
2K
Pressure Drop In Bulb : Application of Graham's Law
Replies
3
Views
3K
Mean distance between air molecules
Replies
10
Views
5K
How many air molecules are there inside the tire?
Replies
3
Views
4K
Calculating the total and partial pressure of gas mixture
Replies
1
Views
2K
10 moles of an ideal gas has a gauge pressure of 2 atm what is new T? no clue
Replies
14
Views
7K
Finding the gauge pressure at the bottom of a barrel
Replies
4
Views
3K
Finding what fraction of molecules have speeds over a certain value
Replies
2
Views
5K
Gauge pressure at the bottom of a barrel
Replies
2
Views
2K
Calculating Molecules in Moles of Oxygen?
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top