Question

A sample of H2(g),which may be assumed
to be ideal is initially at (3)atm & 25 C and
has a volume of (1.5)dm?,expanded until
the volume is (5) dm? (Cp of H2 = 28 8 K1
mot) Find P, TAU, AH & q if the process
is: %3D 1 - Rev isothermal 2- Isothermal
against constant pressure equal to the final
pressure​

Answer 1

Answer:

For isobaric process:

ΔQ=ΔU+ΔW

But, ΔQ=n(

γ−1

γ

)RΔT

ΔU=n

γ−1

R

ΔT

∴

ΔQ

ΔU

=

(

γ−1

γ

)

(

γ−1

1

)

=

γ

1

=

5

3

as γ=

3

5

Hence,

ΔQ

ΔW

=1−

ΔQ

ΔU

=1−

5

3

=

5

2

Thus

5

2

×100%=40% of the heat absorbed is used in doing external work.