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Formula from Chapter 5: First law of thermodynamics

\(q_{\mathrm{black\ box}}\) \(= 2.43\ \mathrm{kJ}\)


\(w_{\mathrm{black\ box}}\) \(= -5.15\ \mathrm{kJ}\)


\(ΔU_{\mathrm{black\ box}}\) \(= q_{\mathrm{black\ box}} + w_{\mathrm{black\ box}}\)

\(\ \ \ =2.43\ \mathrm{kJ} + -5.15\ \mathrm{kJ}\)

\(\ \ \ =-2.72\ \mathrm{kJ}\)