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A 356 G Sample of Ethanol (C2H5OH) Is Burned in a a Bomb

Question 21

Multiple Choice

A 35.6 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter according to the following reaction. If the temperature rose from 35.0 °C to 76.0°C and the heat capacity of the calorimeter is 23.3 kJ A 35.6 g sample of ethanol (C<sub>2</sub>H<sub>5</sub>OH) is burned in a bomb calorimeter according to the following reaction. If the temperature rose from 35.0 °C to 76.0°C and the heat capacity of the calorimeter is 23.3 kJ , what is the value of ΔU°? The molar mass of ethanol is 46.07 g . C<sub>2</sub>H<sub>5</sub>OH(l) + 3O<sub>2</sub>(g) → 2CO<sub>2</sub>(g) + 3H<sub>2</sub>O(g) ΔU°<sub> </sub>= ? A) -1.24 × 10<sup>3</sup> kJ mol<sup>-1</sup> B) +1.24 × 10<sup>3</sup> kJ mol<sup>-1</sup> C) -8.09 × 10<sup>3</sup> kJ mol<sup>-1</sup> D) -9.55 × 10<sup>3</sup> kJ mol<sup>-1</sup> E) +9.55 × 10<sup>3</sup> kJ mol<sup>-1</sup> , what is the value of ΔU°? The molar mass of ethanol is 46.07 g A 35.6 g sample of ethanol (C<sub>2</sub>H<sub>5</sub>OH) is burned in a bomb calorimeter according to the following reaction. If the temperature rose from 35.0 °C to 76.0°C and the heat capacity of the calorimeter is 23.3 kJ , what is the value of ΔU°? The molar mass of ethanol is 46.07 g . C<sub>2</sub>H<sub>5</sub>OH(l) + 3O<sub>2</sub>(g) → 2CO<sub>2</sub>(g) + 3H<sub>2</sub>O(g) ΔU°<sub> </sub>= ? A) -1.24 × 10<sup>3</sup> kJ mol<sup>-1</sup> B) +1.24 × 10<sup>3</sup> kJ mol<sup>-1</sup> C) -8.09 × 10<sup>3</sup> kJ mol<sup>-1</sup> D) -9.55 × 10<sup>3</sup> kJ mol<sup>-1</sup> E) +9.55 × 10<sup>3</sup> kJ mol<sup>-1</sup> . C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g) ΔU° = ?


A) -1.24 × 103 kJ mol-1
B) +1.24 × 103 kJ mol-1
C) -8.09 × 103 kJ mol-1
D) -9.55 × 103 kJ mol-1
E) +9.55 × 103 kJ mol-1

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