The 3D pressure P of a gas is analogous to the 2D tension P or g of a liquid surface, and both can be treated within the framework of a van der Waals equation of state (cf. Eqs. 2.21 and 2.45). However, the pressure of a gas is trying to increase the volume of the gas, while the surface tension is trying to decrease the area of the liquid. Resolve this apparent paradox.
QUESTION 5 2 P Calculate the pressure of a 0.00223 mol of CCl4 vapor that occupies 38.5 L at 19.6 °C if the vapor is treated as a van der Waals gas. (a = 20.4 atm L2 mol-2, b = 0.1383 L mol-1) p = _ Torr OURTION
The van der Waals equation gives a relationship between the pressure p (atm), volume V(L), and temperature T(K) for a real gas: .2 where n is the number of moles, R 0.08206(L atm)(mol K) is the gas con- stant, and a (L- atm/mol-) and b (L/mol) are material constants. Determine the volume of 1.5 mol of nitrogen (a .39 L2 atm/mol2. b = 0.03913 L/mol) at temperature of 350 K and pressure of 70 atm.
The van der Waals equation...
(a) One mole of a monoatomic van der Waals gas obeys the equation of state A3. ) (V-b)=RT (p+ and its internal energy is expressed as U CvT where Cv is the molar isochoric heat capacity of an ideal gas. The gas is initially at pressure p and volume V (i) Explain the physical meaning of the parameters a and b in the equation of state of the gas (ii) Write down the equation that defines entropy in thermodynamics. Define...
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has its own characteristic atom in which a. the atomic mass is constant. b. the atomic number is constant. c. the mass number is constant. d. Two of the above are correct. e. All of the above are correct. 2. Which of the following is not a trace element in the human body? a. iodine b. zinc c. iron d. calcium e. fluorine 3. A...