1. Two ideal gases, A and B, are at the same temperature. If the molecular mass of the molecules in gas A is twice that of the molecules in gas B, the molecules' root-mean-square speed is
(a) The same in both gases.
(b) Twice as great in A.
(c) 1.4 times greater in A.
(d) Twice as great in B.
(e) 1.4 times greater in B.
2. In a mixture of the gases oxygen and helium, which statement is valid?
(a) The helium atoms will be moving faster than the oxygen molecules, on average.
(b) Both will be moving at the same speed.
(c) The oxygen molecules will, on average, be moving more rapidly than the helium atoms.
(d) The kinetic energy of helium atoms will exceed that of oxygen molecules.
(e) None of the above.