(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

An ideal gas at 25degree celcius and 100kPa is allowed to expand reversibly and isothermally to 5kPa. Calculate..

1) w per mol (J/mol)

2) q per mol (J/mol)

3) change in molar internal energy U (J/mol)

4) change in molar enthalpy H (J/mol)

2. Relevant equations

ΔU = q + w

= q - pextΔV

ΔH = ΔU +p ΔV

= ΔU + ΔngasRT

PV=nRT

Um(T)=3/2RT

3. The attempt at a solution

I absolutely have no idea how to do this question. Any direction would be greatly appreciated.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Calculating q,w,H and U

**Physics Forums | Science Articles, Homework Help, Discussion**