(1). (15 points) Multiple choice questions (1a). (3p) The compressibility chart (the Nelson-Obert Chart, A-15) determines: (A) If the 1st Law of Thermodynamics is valid. (B) If the gas behaves as a simple compressible substance. (C) If the gas is near the triple point. (D) How closely such a gas resembles an ideal gas. (E) All of the above. (1b). (3p) The ideal gas model assumes that... (A) The gas is a mixture of multiple substances. (B) Heat transfer is zero. (C) The gas is a high-density substance. (D) The size of the gas particles is negligible. (E) The has particles do not interact. (1c). (3p) For an ideal gas... (A) Its latent energy is much smaller than its sensible energy. (B) Its sensible energy is much smaller than its latent energy. (C) Its thermal energy is negligible. (D) A model of an incompressible fluid (compressed liquid) is applicable. (E) A model of a saturated liquid-vapor mixture is applicable. (1d). ( 3p ) Which of the following statement(s) about the ideal gas model is (are) invalid? (A) The compressibility factor of ideal gas is equal to 1 . (B) A substance can be considered as ideal gas if its compressibility factor is in the range 00.95). (D) Ideal gas is a vapor that is always close or even on the saturated vapor line. (E) Ideal gas is such a vapor that can be from the saturated vapor line. (1e). (3p) Which of the following statement(s) about an ideal gas is (are) valid? (A) A substance can be considered as an ideal gas if its compressibility factor is around 1(>0.95). (B) Ideal gas is a specific vapor that is far from a saturated vapor line. (C) Ideal gas is a vapor that is around (close to) saturated vapor line. (D) For an ideal gas, the specific internal energy and specific enthalpy are the functions of T only. (E) None of the above are valid