Question one:

Part A When a 3.40 g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.5 âC. The heat capacity of the calorimeter, measured in a separate experiment, is 6.12 kJ/âC . Determine ÎErxn for the combustion of octane in units of kJ/mol octane. Express your answer using three significant figures.

Question two:

Part A

Under what conditions is the change in internal energy, ÎE _rxn , equal to the heat evolved in a reaction?

Under what conditions is the change in internal energy, ÎE _rxn , equal to the heat evolved in a reaction?

Constant volume

Constant pressure

Constant temperature

ÎE _rxn is never equal to the heat evolved in a reaction.

can someone explain how to do these?

Question

Question one:

Part A When a 3.40 g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.5 âC. The heat capacity of the calorimeter, measured in a separate experiment, is 6.12 kJ/âC . Determine ÎErxn for the combustion of octane in units of kJ/mol octane. Express your answer using three significant figures.

Question two:

Part A

Under what conditions is the change in internal energy, ÎE _rxn , equal to the heat evolved in a reaction?

	Constant volume
	Constant pressure
	Constant temperature
	ÎE _rxn is never equal to the heat evolved in a reaction. can someone explain how to do these?

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