How Do You Calculate Pressure of Helium in Different Conditions?

Thread starter jvpk4
Start date Mar 18, 2010
Tags

Test

AI Thread Summary

To calculate the pressure exerted by 0.3000 moles of helium in a 0.2000L container at -25.0°C, the ideal gas law (PV=nRT) can be applied first, where P is pressure, V is volume, n is moles, R is the gas constant, and T is temperature in Kelvin. The temperature must be converted to Kelvin, resulting in 248.15 K, and then the pressure can be calculated. For van der Waals' equation, which accounts for real gas behavior, the constants a and b are used to adjust the ideal gas law for helium, allowing for a more accurate pressure calculation. Understanding the variables in both equations is essential for solving the problem effectively. This approach will yield the pressure values using both methods.

Mar 18, 2010

jvpk4

Calculate the pressure exerted by 0.3000 mole of He in 0.2000L container at -25.0^o C

a) Using the ideal gas law
b) Using van der Waal's equation (a=0.0341 atmL^2/mol^2 and b = 0.0237 Lmol)

i have no idea how to do this problem?? please helppp

Chemistry news on Phys.org

Mar 18, 2010

chemisttree

Science Advisor

Homework Helper

Gold Member

Start by writing down the two gas laws you are given. Try to understand what the variables in those equations mean and what variables you are given.

Thread 'Solubility of MgSO47H2O in water'

It seems like a simple enough question: what is the solubility of epsom salt in water at 20°C? A graph or table showing how it varies with temperature would be a bonus. But upon searching the internet I have been unable to determine this with confidence. Wikipedia gives the value of 113g/100ml. But other sources disagree and I can't find a definitive source for the information. I even asked chatgpt but it couldn't be sure either. I thought, naively, that this would be easy to look up without...

View full post »

Thread 'Enthalpy - published values'

Do the published values of Enthalpy include the work done against a constant pressure, e.g., the atmosphere? (I am not a chemist). I am reviewing enthalpy and entropy as part of the statistical mechanics applied to transistors. I assume, from my reading, that the work done would mostly apply to reactions involving gasses.

View full post »

Thread 'Why does having 8 valence electrons make an element inert?'

I was introduced to the Octet Rule recently and make me wonder, why does 8 valence electrons or a full p orbital always make an element inert? What is so special with a full p orbital? Like take Calcium for an example, its outer orbital is filled but its only the s orbital thats filled so its still reactive not so much as the Alkaline metals but still pretty reactive. Can someone explain it to me? Thanks!!

View full post »