Solution: Calculate the change in internal energy for a gas using the first law of thermodynamics. The gas transfers 485 J of energy as heat to the surroundings.Pext = 1.01 x 105 PaV1 = 2.30 LV2 = 2.05 L

Problem

Calculate the change in internal energy for a gas using the first law of thermodynamics. The gas transfers 485 J of energy as heat to the surroundings.

Pext = 1.01 x 105 Pa

V1 = 2.30 L

V2 = 2.05 L

Solution

For a gas, the internal energy (ΔE or ΔUof a system can be calculated from the heat and work of the system.

The relationship between internal energy, heat, and work is shown in the following equation:

E=q+w

 Where

ΔE = internal energy, J

q = heat, J

w = work, J


To solve for Internal Energy, we have to:

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