Question

thermodynamics
assume ideal gas
how to calculate deferance of enthalpy betwen two states in a isothermic change?

Answer 1

@experimentX that mast not be so
enthalpy=internal energy +P*V
H=U+P*V

Answer 2

\[\Delta H =\Delta U +\Delta PV\]
It's isothermic so \[\Delta U=0\]

Answer 3

during isothermal change, the internal energy of gas remains constant ... well that is my assumption. Haven't been doing these stuff for long ... so not really sure.

Answer 4

that is exactly my problem
isothermic => P*V=constant
there for ΔPV=0

Answer 5

I think isothermic means same temperature.

Answer 6

\[\Delta nrt=nR \Delta T =0\]

Answer 7

isothermic =isothermal

Answer 8

so it is ΔH=0 ?

Answer 9

I think internal energy of gas depends on temperature.

Answer 10

if we are keeping the temperature same as well as applying heat or absorbing heat, then of course the gas must be allowed to expand. Work is done on the gas or done by the gas.

Answer 11

if so that rases next question

is ΔHa1b=ΔH12b=0 ??