Chem help

[blackish.gold23]

Hey there
Second year bio student in desperate need of physical chemistry help!!

 

[Hamnah Zahoor]

Hey there
Second year bio student in desperate need of physical chemistry help!!

A level or O level?

 

[blackish.gold23]

University student, so I'm guessing A level

 

[Hamnah Zahoor]

University student, so I'm guessing A level

Post the questions in which you face problems, I will see If I am able to help you out.

 

[blackish.gold23]

Why is the internal pressure of a perfect gas zero?

 

[Hamnah Zahoor]

A perfect gas or also known as the ideal gas have a zero internal pressure because we are considering intermolecular forces negligible so WITHIN the gas molecules there is no attraction and no pressure within the gas thus internal pressure is zero.

 

[blackish.gold23]

A perfect gas or also known as the ideal gas have a zero internal pressure because we are considering intermolecular forces negligible so WITHIN the gas molecules there is no attraction and no pressure within the gas thus internal pressure is zero.

Ohh, I understand that. Thanks...I have another question though.
(The constant-pressure heat capacity of a sample of a perfect gas was found to vary with temperature according to the expression Cp /(J K−1) = 20.17 + 0.3665(T/K). Calculate q, w, ΔU, and ΔH when the temperature is raised from 25°C to 200°C (a) at constant pressure, (b) at constant volume. ) <--- I dont understand where to begin this question, like...what formulas do I use?

 

[Hamnah Zahoor]

Ohh, I understand that. Thanks...I have another question though.
(The constant-pressure heat capacity of a sample of a perfect gas was found to vary with temperature according to the expression Cp /(J K−1) = 20.17 + 0.3665(T/K). Calculate q, w, ΔU, and ΔH when the temperature is raised from 25°C to 200°C (a) at constant pressure, (b) at constant volume. ) <--- I dont understand where to begin this question, like...what formulas do I use?

Sorry......I haven't solved these types of questions yet I have just started my second year of A level.

 

[Hamnah Zahoor]

I haven't logged in at this site but I hope it helps........
https://www.chegg.com/homework-help...nd-vary-temperature-according-expres-q1469871

 

[komal Shah]

thanks

 

[ssxxss]

hey does anyone have as level chemistry chapterwise past papers from 2012 to 2018 i just need atomic structure and chemical bonding at the moment