Question

A sample of ideal gas has a volume of 128 ml at -27 °C to what
temperature must the gas be heated at constant pressure if final
volume is to be 214 ml?​

Answer 1

Explanation:

Let n be the no of moles of the gas.

Let the temp changes from T

1

to T

2

and volume from V

1

to V

2

respectively.

Heat supplied: Q=nC

p

(T

2

−T

1

)=140

Change in internal energy: ΔU=nC

v

(T

2

−T

1

)=n

γ

C

p

(T

2

−T

1

)=

1.4

140

=100J

Work done by the gas: ΔQ−ΔW=140−100=40J