Question

In an ideal gas, which of the following quantities can be determined by measuring just the temperature of the gas?

       A) R - the ideal gas constant
       B) The average kinetic energy of the molecules
       C) The average velocity of the molecules
       D) The total kinetic energy of the molecules
       E) N_A - the Avogadro's number

You have two boxes, one containing some hot gas and the other containing some cold gas. This is all you know about these boxes. What can you validly conclude about the characteristics of the gas in the boxes?

       A) The molecules in the hot gas have higher average velocity than those in the cold gas.
       B) The molecules of the hot gas have more total kinetic energy than those of the cold gas.
       C) The molecules of the hot gas have greater average kinetic energy than those of the cold gas.


       D) The pressure of the hot gas is greater than that of the cold gas.


       E) There are more air molecules in the hot air box than in the cold air box.

Answer 1

Part A B) The average kinetic energy of the molecules Average kinetic energy depends only on Temperature. Not any other variables. Part B C) The molecules of the hot gas have greater average kinetic energy than those of the cold gas. All other options depend on the other variable. But average kinetic energy only depends on temperatute.