Please help with the following!!!! For the following processes, state whether ea
ID: 478774 • Letter: P
Question
Please help with the following!!!!
For the following processes, state whether each of the thermodynamic quantities q, w. lambda U, and lambda H is greater than, equal to, or less than zero for the system described. Explain your answers briefly. An ideal gas expands adiabatically against an external pressure of 1 bar. An ideal gas expands isothermally against an external pressure of 1 bar An ideal gas expands adiabatically into a vacuum. A liquid at its boiling point is converted reversibly into its vapor, at constant temperature and 1 bar pressure H2, gas and O2, gas react in a closed bomb at 25 degree C, and the product water is brought back to 25 degree C.Explanation / Answer
A.
q=0(adiabatic process), w<0(system doing work)
H,U<0(U=q+w)
B.
q>0(heat absorbed), w<0(system doing work)
U=H=0(as temperature is constant).
C.
q=w=0(adiabatic expansion in vaccum)
U=H=0
D)
q>0(liquid converted to vapour), w<0(vapour formed undergo expansion)
U=H>0 (liquid converted to vapour)