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13 Dec 2019

When a 3.20 g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 26.7 ∘C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.28 kJ/∘C. Determine ΔErxn for the combustion of octane in units of kJ/mol octane. Three sig figs

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Reid Wolff
Reid WolffLv2
17 Dec 2019

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Related questions

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 ∘C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.12 kJ/∘C . Determine ΔErxn 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, ΔE rxn , equal to the heat evolved in a reaction?

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

Constant volume
Constant pressure
Constant temperature

ΔE rxn is never equal to the heat evolved in a reaction.

can someone explain how to do these?

1) When a 3.20 g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.2 ∘C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.16 kJ/∘C . The calorimeter also contains 3.00 kg of water, specific heat capacity of 4.18 J/g°C. Determine ΔErxn for the combustion of octane in units of kJ/mol octane.

Express your answer using three significant figures.

2) When 3 moles of Y is reacted with excess X at constant pressure, the reaction forms XY2 and 3450 kJ of heat.

X + 2 Y --> XY2

What is the enthalpy of the reaction in kJmol of XY2?:

Express your answer using four significant figures.

3) Visible light that has a wavelength between 495nm and 570nm will appear green. What is the frequency of green light with a wavelength of 500 nanometers (nm), where 1nm=10−9m. ?

Express your answer to three significant figures and include the appropriate units.

I completely lost in these questions. Can someone help me?

A 1.00-g sample of octane (C8H18) is burned in a bomb calorimeter that has a heat capacity of 5.80 kJ/°C. The temperature of the calorimeter rises from 25.00oC to 33.20oC. What is ?U per mole for the combustion of octane? Select one: a. –47.6 kJ/mol b. –416 kJ/mol c. –707 kJ/mol d. –5.43 ×103 kJ/mol e. –1.86 ×105 kJ/mol

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