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A gas is compressed from an initial volume of 5.1 L to a final volume of...

A gas is compressed from an initial volume of 5.1 L to a final volume of 3.4 L under a constant pressure of 1.20 atm. During the compression, the gas releases 86 J of heat. Calculate the change in internal energy and in enthalpy.

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Answer #1

Ans.

Initial volume = 5.1L

Final volume = 3.4L

Change in volume is

Pressure, P = 1.20 atm

1 atm = 101.3 J/L

Therefore,

Calculate work using the formula below

Heat released, q = -86J

Change in internal energy is given by

(q is negative since heat is released)

Therefore, change in internal energy = + 121J

The positive sign indicates that the internal energy increases in the system.

The change in enthalpy is

Therefore, change in enthalpy = -86J, which is the same as heat released.

The negative sign indicates that the enthalpy decrease.

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