Estimate the change in enthalpy and entropy when liquid chocolate at 450 K is compressed from 250 kPa to 1500 kPa. For liquid chocolate at 450 K, v = 1.02 ×10−3 m3 kg−1 and β = 1.5 ×10−3K−1.

In freezing a mole of liquid water at the freezing point, the enthalpy of fusion is 6.01 KiloJoules per mole. Answer the questions that follow. (A). What is the entropy change of this process (in Joules per Kelvin)? Express answer in THREE SIGNIFICANT FIGURES. (B). What is the entropy change of the surroundings for this process (in Joules per Kelvin)? Express answer in THREE SIGNIFICANT FIGURES. (C). What is the total entropy change (or the entropy change of the universe) for this process (in Joules per Kelvin)? Express answer in THREE SIGNIFICANT FIGURES.

2. Determine the density of steam at 200 bar and 400 °C. a) Use the ideal gas law b) Use the compressibility factor. c) How can you easily verify your number? How well did the models work?

A diatomic ideal gas sample undergoes reversible adiabatic process. Initially, the volume of the gas was 30.5 L/mol at 1 bar and 298.7 K. After the process, the molar volume doubles. What is the final temperature?