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

[owura143]

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

 

[ElikuAberts]

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".

 

[nlightner]

moles/m3

Thank you for reaching out for help with this question. Based on the information provided, it seems like you have correctly used the ideal gas law to calculate the number of moles of water vapor per cubic meter of air. Your calculation of 1.67 moles/m3 is correct. Keep in mind that this value may vary depending on the accuracy of the given data and the assumptions made in the calculation. If you have any further questions or concerns, please do not hesitate to ask.