Calculate the Internal Energy Change, Δ_rU, for the Combustion of 6.9261

question 23

Multiple Choice

Calculate the internal energy change, Δ_rU, for the combustion of 6.9261 g of diethylene glycol (C₄H₁₀O₃, molar mass = 106.120 g mol^-1) if the combustion inside a bomb calorimeter, C_cal = 13.84 kJ °C^-1, causes a temperature change from 22.8 °C to 34.0 °C.

• A) -4.39 × 10³ kJ mol^-1
• B) -9.16 × 10² kJ mol^-1
• C) -2.37 × 10³ kJ mol^-1
• D) 4.39 × 10³ kJ mol^-1
• E) 1.18 × 10³ kJ mol^-1

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