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## Homework Statement

One mole of an ideal gas at 300K expands isothermally from a pressure of 2x10^6 N/m^2 to a pressure of 2x10^5 N/m^2.

Derive the equations for, and calculate:

the heat absorbed by the gas...

the change in the internal energy of the gas...

the entropy change in the gas if it expands reversibly

## Homework Equations

Q=mc(Δt)

ΔE = Q - W

PV = nRT

W = PΔV

Another equation involving ΔE, but i am not sure what it is...

## The Attempt at a Solution

Since it is an isothermic equation, there is no Δt...which makes the ΔE equal zero(the internal energy). Since the internal energy is zero, that makes the equation ΔE=Q-W into Q=W. I am not sure how to finish the problem, because i have a change in pressure...but there is no change in temperature...