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

question 51

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 ${ } ^ { \circ } \mathrm { C } ^ { - 1 }$ ,what is the value of $\mathrm { D } _ { \mathrm { r } } U ^ { \circ }$ ? The molar mass of ethanol is 46.07 g $\mathrm { mol } ^ { - 1 }$ . C₂H₅OH(l) + 3O₂(g) ? 2CO₂(g) + 3H₂O(g) $\mathrm { D } _ { \mathrm { r } } U ^ { \circ }$ = ?

• 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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Definitions:

Blood Pressure

The force exerted by blood against the inner walls of the blood vessels.

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The pulsation of the heart, including one complete contraction and relaxation cycle, distributing blood throughout the body.

Medulla

The innermost part of an organ or structure, such as the medulla oblongata of the brain that controls autonomic functions, or the inner region of an adrenal gland.

Hypothalamus

A region of the brain that coordinates many bodily functions, including hunger, thirst, temperature regulation, and the release of hormones.