How Do You Calculate Moles of Water Vapor in Air Using Ideal Gas Law?

AI Thread Summary
To calculate the moles of water vapor in air using the Ideal Gas Law, the relative humidity of 55% at 30.0°C corresponds to a vapor pressure of 4200 Pa. The temperature must be converted to Kelvin, resulting in 303 K. The formula n/v = p/RT is applied, where p is the vapor pressure, R is the gas constant (8.32 J/(mol·K)), and T is the temperature in Kelvin. Using these values, the calculation yields approximately 1.67 mol/m³. Further clarification is needed on converting the results to the desired units.
owura143
Messages
12
Reaction score
0
The relative humidity is 55% on a day when the temperature is 30.0°C. Using the graph below, determine the number of moles of water vapor per cubic meter of air.


on the graph, Vapor pressure of water is on the y-axis and temperature on the x-axis 30C cordinates with 4200 Pa of water vapor.


This how i tried to sove it.

Since 30 corresponds to 4200 Pa

T in Kelvin =303
n/v = p/RT
=4200/(8.32 x 303)
= 1.67
 
Physics news on Phys.org
I need help with this same problem...

http://www.webassign.net/CJ/12_76.gif

That is the graph, if anyone can help.

EDIT... I really don't know where to start at all. I tried to do it (almost) the same way as owura, but I couldn't figure it out how to find it in "mol/m^3".
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »
Thread 'Trying to understand the logic behind adding vectors with an angle between them'

Thread 'Trying to understand the logic behind adding vectors with an angle between them'

My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Ideal Gas Law and Pressure at 80°C
Replies
2
Views
3K
Calculations using the Ideal Gas Law
Replies
2
Views
2K
What would be a real-life example of the ideal gas law?
Replies
3
Views
10K
What Is the Highest Temperature Reached in the Ideal Gas Cycle?
Replies
4
Views
3K
Ideal Gas Law Homework: Calculating Number Density and Spacing Between Molecules
Replies
2
Views
2K
How to Calculate Temperature Change in Ideal Gas Law Problem for One Mole?
Replies
13
Views
2K
Calculating Volume of Escaped Air Bubble Using Ideal Gas Law | Homework Question
Replies
2
Views
2K
Detemining the mass of water vapour in air (Ideal gas law)
Replies
1
Views
2K
Predicting Remaining Pressure in Compressed Gas Cylinder
Replies
3
Views
3K
Volumetric flow rate ratio calculation
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top