Calculate the Internal Energy Change, Δ_rU, for the Combustion of 29.3

question 62

Multiple Choice

Calculate the internal energy change, Δ_rU, for the combustion of 29.3 g of vitamin C (C₆H₈O₆, molar mass = 176.124 g mol^-1) if the combustion inside a bomb calorimeter, C_cal = 8.31 kJ °C^-1, causes a temperature change from 21.5 °C to 68.3 °C.

• A) -1.78 × 10³ kJ mol^-1
• B) -2.34 × 10³ kJ mol^-1
• C) -6.03 × 10³ kJ mol^-1
• D) -9.19 × 10² kJ mol^-1
• E) -1.67 × 10² kJ mol^-1

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