A gas filled cylinder equipped with a piston expands against an external pressur

Question

A gas filled cylinder equipped with a piston expands against an external pressure of 2.50atm from 1.25L to 1.50L. At the same time, 85.0J of heat is absorbed by the gas. A. Calculate work of the system in L-atm B. Determine the change in internal energy of the system in Joules. C. What would be the change in enthalpy of the system in joules? A gas filled cylinder equipped with a piston expands against an external pressure of 2.50atm from 1.25L to 1.50L. At the same time, 85.0J of heat is absorbed by the gas. A. Calculate work of the system in L-atm B. Determine the change in internal energy of the system in Joules. C. What would be the change in enthalpy of the system in joules? A. Calculate work of the system in L-atm B. Determine the change in internal energy of the system in Joules. C. What would be the change in enthalpy of the system in joules?

Explanation / Answer

Therodynamics

Gas filled cyllinder expands at,

Pext = 2.50 atm

from,

V1 = 1.25 L to V2 = 1.50 L

A. work done = -Pext(V2 - V1)

                      = -2.50(1.50 - 1.25)

                      = 0.625 L-atm

B. change in internal energy dU

dU = dq + w

with,

dq = 85 J

we get,

dU = 85 + 0.625 x 101.33 = 148.33 J

C. change in enthalpy dH

This is an isothermal expansion,

dT = 0

So,

dH = 0

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