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Veronica_Lubera_2A wrote:Also another derivation of the formula we learned in class today was DeltaU=DeltaH-P(DeltaV) if the pressure is constant.
And if the volume is constant, work is equal to 0 because the DeltaV in the work term is 0. So, in that case, DeltaU = q
When a question asks you to find change in internal energy, they are asking you to find DeltaU, and depending on the conditions given in the questions, the calculation of it will be different. In general, it is given by DeltaU = q +w
Internal energy, U, is a state property and functions from its final and initial states. For example, if a closed system is changed by heating (+q) and compression (+w) then the equation for internal energy is: delta U = q + w. If volume is constant, delta U = q(v).
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