Calculate the change in internal energy (ΔE)for a system that is giving off 25.0 kJ of heat and is changing from 18.00 L to 15.00 L in volume at 1.50 atm pressure.(Remember that 101.3 J = 1 L^∙atm)

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Quizplus · Accepted Answer

The change in internal energy (ΔE) is calculated using the formula ΔE = q + w, where q is the heat exchanged and w is the work done. Here, q = -25.0 kJ (since the system is giving off heat). The work done by the system is w = -PΔV = -(1.50 atm)(-3.00 L) = 4.50 L∙atm. Converting this to kJ: 4.50 L∙atm * 101.3 J/L∙atm * (1 kJ/1000 J) = 0.45585 kJ. Therefore, ΔE = -25.0 kJ + 0.45585 kJ = -24.54415 kJ, which rounds to -24.5 kJ.

Calculate the Change in Internal Energy (ΔE)for a System That