202212091158 Solution to 1965-HL-PHY-3

(a) State the three different types of heat transfer, and give a simple example for each type of heat transfer.
(b) Calculate the amount of heat required to change 10\,\mathrm{g} of ice in a sealed container of volume 1\,\mathrm{L} and pressure at 1\,\mathrm{atm} at -20\,^\circ\mathrm{C} to steam at 120\,^\circ\mathrm{C}. (Neglect the heat absorbed by the air and the container. The specific heat of ice and steam is 0.5\,\mathrm{cal\,g^{-1}\,^\circ C^{-1}}). What is the pressure inside the container expressed in atmospheric pressure, when the 10\,\mathrm{g} of ice is completely changed to steam at 120\,^\circ\mathrm{C}?


Roughwork.

(a) Skip it.

(b) Stuck. Any equation of state f(P,V,T)=0 as may well be applicable to solids and liquids as the ideal gas law PV=nRT to gases, lacking the enthalpies of fusion and vaporisation unknown?

(to be continued)