Multiple Choices 11-1 If the volume, pressure and temperature of an ideal gas are V, p, and T, respectively. The mass of a molecule is m, k is the Boltzmann's constant, R is the universal gas constant, then the number of molecules in this gas is ((A) PV pV (B) kT pV (C) RT pV (D) mT 11-2 A closed cylinder is separated by a piston into two parts with one of them Gled with hydrogen of mass 0.1 kg at a certain temperature. If the piston is kept in the center of the cylinder, the mass of the oxygen in the other part of the same temperature is () (A), kE- 16 (B) 0.8 kg. (C) 1.6 kg. 11-3 (D) 3.2 kg. A certain amount of ideal gas is stored in a container with its temperature T and molecular mass m. According to the microscopic model of an gas and the statistical assumptions, the average value of the square of the x ideal Components of the velocities of the molecules is () 1 3kT (A) u =, 3kT Av ( B).% 3! 3V mm kT 3kT (D) v = (C) = m mperature T and molecular mass m. According to the microscopy model of an 'she statistical assumptions, the average value of the x components of 11-4 A certain amount of ideal gas is stored in a container with its8kT (A) v, = 1 8kT (B) v, = - 3V TIm (D) v, = 0. 8kT (C) ?, = 3rm constant, the temperature of the gas after expansion will ((A) increase. Relationaling 11-5 A certain amount of ideal gas expands obeying they (B) decrease. (D) be impossible to determine. 11-6 A bottle of helium and bottle of nitrogen have the same denits the same average translational kinetic energy of the molecules. They are (C) not change. Thermal equilibrium, then ((A) they have the same temperature and pressure. ( B) they have the different temperature and pressure. (C) they have the same temperature and the pressure of helin than that of nitrogen. (D) they have the same temperature and the pressure of helium is less th that of nitrogen. 11- 7 If helium and oxygen have the same temperature and pressure, te average kinetic energy &, and the average translational kinetic energy E of the tw molecules have the following relationship ((A) They have the same ?, and the same E: (B ) Their &, are the same, and ? are not the same. (C) Their ?, are not the same, but are the same. (D) Both their ?, and ? are not the same. 11-8 At temperature T, the internal energy of 1 mol rigid diatomie molecules is ((A) RT. (B) AT. (D) AT. 11-9 Suppose the temperature of oxygen is doubled and oxygen molecules, are ionized into oxygen atoms. Compared with that of the original oxygen molecules, the average speed of these oxygen atoms is ((A) 4 times greater. (B) 2 times greater. (C) 2 times greater. 1 (D) times greater. 11 -10 A certain amount of hydrogen that can be taken as an ideal gas is stored in a cylinder. If the. Temperature is heldled, Tor the mean collision frequency Z and the mean free path A, we have (A) both Z and A are doubled. B) both Z and A are halved. (c) ? is doubled, while A is halved. (D) Z is halved, while A is doubled. 11-11 The temperature of an ideal gas is kept constant. When its volume ases, for the mean collision frequency Z and the mean free path A, we have (A) ? increases and A is unchanged. (B) ? decreases and A increases. (C) Z increases and A decreases. (D) ? is unchanged and A increases.