- #1

morsel

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## Homework Statement

Suppose 161 moles of a monatomic ideal gas undergoes an isothermal expansion as shown in the figure (attached). The horizontal axis is marked in increments on 20 m

^{3}

What is the temperature at the beginning and at the end of this process?

## Homework Equations

PV = nRT

## The Attempt at a Solution

P

_{i}= 400 kPa

V

_{i}= 20 m

^{3}

P

_{f}= 100 kPa

V

_{f}= 80 m

^{3}

T = (PV)/(nR) = (400*20)/(161*8.31) = 5.98 K

My answer is wrong according to the online homework grading system. What am I doing wrong?

Any help is appreciated.