Chapter 19, Problem 2E

As shown here, one type of computer keyboard cleaner contains liquefied 1, 1-difluoroethane (C₂H₄F₂), which is a gas at atmospheric pressure. When the nozzle is squeezed, the 1, 1-difluroenthane vaporizes out of the nozzle at high pressure, blowing dust out objects.

1. Based on your experience, is the vaporization a spontaneous process at room temperature?
2. Defining the 1.1-difluoroethane as the system, do you expect q_sys for the process to be positive or negative
3. Predict whether ΔS is positive or negative for this process.
4. Given your answer to (a), (b), and (c), do you think the operation of this product depends more on enthalpy or entropy? [Sections 19.1 and 19.2]