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Question

For a reversible isothermal expansion of one mole of an ideal gas at 300K, from a volume of 10 dm3 to 20 dm3, ΔH is:

A
1.73 KJ
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B
1.73 KJ
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C
3.46 KJ
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D
Zero
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Solution

The correct option is A Zero
The correct answer is option(D).

Solution:

Asgivenprocessexpandedisothermallymeansataconstanttemperature

ΔT=constant

Theinternalenergyofgasesdependsonthetemperatureasweincreasethetemperaturethekineticenergyofmoleculesincreasesthatincreasetheinternalenergyofmolecules.

Therefore,theinternalenergyofgasesalsoremainsconstantatconstanttemperature.

Soforgivenisothermalprocess.

ΔE=0

Hence,zero (0) is the answer.

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