Recent content by babita

please reply someone...thanks

Homework Statement In my book it is given that ΔHffor NaCl is less negative than that for KCl. I'm not able to understand that...I think that electrostatic attractions between Na+ and Cl- will be stronger than K+ & Cl- as Na has smaller size than K...in its formation more energy should be...

i know that.... my doubt was that P & V which are describing the state should be same(initial and final), then we can compare the work done through 2 ways: adiabatic & isothermal but i have got it..the graph simply indicates that if we expand a gas and do it isothermally it would require more...

hey serena i will be glad if you can answer this... https://www.physicsforums.com/showthread.php?t=598965 thankyou

and yes U is proportional to n, equation makes sense at constant T ...missed that point... thanks :)

yeah sry ...that was silly

Also Internal energy of an ideal gas is directly proportional to T

Cv is heat capacity at constant volume...i don't think volume is constant here...in my book the equation have been derived assuming constant T & P.

amount of matter may or may not change...Δn means no of moles of gaseous products minus no of moles of gaseous reactants THAT is my confusion...at constant T , ΔU makes no sense

hi:smile: yeah that would have made sense but its written "at constant temperature" every where :'(

Homework Statement I'm not able to understand the following equation ΔH = ΔU + (Δn)RT firstly if T is taken to be constant (as the book says), ΔU = 0 if T is not constant then which T i am supposed to put in? initial or final? Homework Equations please help. Thank you. The...

Homework Statement In the graph attached, why is isothermal graph line higher than adiabatic one?? Homework Equations The Attempt at a Solution At first, i had thought that work done in an isothermal process is greater than in an adiabatic process...but for comparison we would...

okkk...i was unable to understand the corrections made by van der waals in IGE...would u pls check if I'm getting it right... in PV=nRT V is the volume that is available to the gas molecules, since at ideal gas conditions(high T and low P) the volume of particles is negligible,we can write the...

please reply...i'm going mad:mad::mad:

Homework Statement (P+ an^2/V^2)(V-nb) = nRT I'm having some problems in understanding the above equation. firstly, PV=nRT holds for ideal P and V , so after correction we are writing ideal P and V in terms of measured P and V right? secondly V-nb is the actual volume not the ideal...