Question

2 moles of helium is heated at constant pressure from 0°C to 50°C. find enthalpy change.​

Answer 1

Answer:

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Explanation:

As it is a constant pressure process, using Charles law we get

T

V

​

=constant. Thus for a threefold increase in volume we get threefold increase in temperature. Thus we get the final temperature as 3(273)=819K. Thus ΔT=819−273=546K.

Now as helium is a diatomic molecule, its degree of freedom f is 5. Ths we get C

p

​

for it as (1+

2

f

​

)R=(1+

2

5

​

)R=

2

7

​

R.

Thus heat transferred will be given as ΔQ=nC

p

​

ΔT

or

ΔQ=1(

2

7

​

)(1.987)(546)= 361 cal

Answer 2

Explanation:

Here's the answer hope this helps

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