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## Homework Statement

Initial

pressure: 140kPa

Temperature: 25C or 298K

Volume: 0.14m^3

Final

Pressure:1.4MPa or 1400kPa

It uses index compression, n=1.25. So PV^1.25 = constant.

c_p = 1.041kJ/kg.K and c_v = 0.743 kJ/kg.K

## Homework Equations

¥ = c_p/c_v

ΔS=c_v*ln(Tf/Ti) + R*ln(Vf/Vi) [i think]

## The Attempt at a Solution

I found ¥ to be 1.4012

PV^n = 12 therefore Vf = 0.0222

140*0.14^1.25=11.989

1400*Vf^1.25=11.989

Vf^1.25=11.989/1400