# Problem: When a fixed amount of ideal gas goes through an isothermal expansion(1) it's internal (thermal) energy does not change.(2) The gas does no work,.(3) No heat enters or leaves the gas.,(4) Its temperature must decrease.(5) None of the above.

###### FREE Expert Solution

The isothermal process occurs at a constant temperature.

The change in temperature is then:

$\overline{){\mathbf{∆}}{\mathbf{T}}{\mathbf{=}}{\mathbf{0}}}$

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###### Problem Details

When a fixed amount of ideal gas goes through an isothermal expansion

(1) it's internal (thermal) energy does not change.

(2) The gas does no work,.

(3) No heat enters or leaves the gas.,

(4) Its temperature must decrease.

(5) None of the above.