These calculations are from the Thermochemistry chapter (the two methods of calculating q via heat capacity and via ΔHvap for a specific quantity of matter).

Critical Skills #6 Heating and Cooling Curves Name These calculations are from the Thermochemistry chapter (the two methods of calculating q via heat capacity and via ΔHvap for a specific quantity of matter)

Critical Skills #6 Heating and Cooling Curves Name These calculations are from the Thermochemistry chapter (the two methods of calculating q via heat capacity and via
for a specific quantity of matter). Three individual calculations required, then combined to give the total energy required or released. Think about each process, is energy being released or absorbed? Consider the chlorofluorocarbon CCl
F
: Normal boiling point = 47.6°C Specific heat of the liquid phase = 0.91

Heat (enthalpy) of Vaporization = 27.49 kJ/mol Specific heat of the vapor phase = 0.67

1) Calculate the total heat (q) in kJ required to convert 50.0 g CCl
F
from the liquid phase at 5°C to the gas phase at 80°C. (Note: what is the chemical reaction for the phase change?) Show all work with good problem-solving skills. 2) Plot the heating curve with temperature (°C) on the y axis and heat added (q, kJ) on the x axis (this is additive). 3) Likewise plot the cooling curve from 80°C to 5°C – on the x axis you want heat released (release = negative sign) Heating Curve Cooling Curve Total Heat

The Correct Answer and Explanation is: