Posted by **Tulika** on Monday, April 9, 2012 at 1:07pm.

A monoatomic gas expands isobarically.What will be the percentage of heat supplied that increases the thermal energy and that involved in doing work for expansion?

- Physics -
**Elena**, Monday, April 9, 2012 at 2:28pm
The first law of thermodynamics

ΔQ =ΔU + W.

The work done by system is

W = p•ΔV =ν•R•ΔT.

The change in internal energy is

ΔU = ν•(i/2) •R•ΔT,

where the degrees of freedom i = 3,

ΔQ =ΔU + W = ν•(i/2) •R•ΔT + ν•R•ΔT = =2.5 •ν•R•ΔT,

ΔU/ ΔQ = ν•(i/2) •R•ΔT /2.5 •ν•R•ΔT =3/5 = 0.6.

60%

W/ ΔQ = ν•R•ΔT/2.5 •ν•R•ΔT = 0.4

40%

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