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 âC. The heat capacity of the calorimeter, measured in a separate experiment, is 6.16 kJ/âC . The calorimeter also contains 3.00 kg of water, specific heat capacity of 4.18 J/g°C. Determine ÎErxn 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=10â9m. ?
Express your answer to three significant figures and include the appropriate units.
I completely lost in these questions. Can someone help me?
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 âC. The heat capacity of the calorimeter, measured in a separate experiment, is 6.16 kJ/âC . The calorimeter also contains 3.00 kg of water, specific heat capacity of 4.18 J/g°C. Determine ÎErxn 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=10â9m. ?
Express your answer to three significant figures and include the appropriate units.
I completely lost in these questions. Can someone help me?
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