If equal masses of O 2(g) and HBr(g) are in separate containers of equal volume and temperature, which one of the following statements is true?
a) The pressure in the O 2 container is greater than that in the HBr container.
b) There are more HBr molecules than O 2 molecules.
c) The average velocity of the O 2 molecules is less than that of the HBr molecules.
d) The average kinetic energy of HBr molecules is greater than that of O 2 molecules.
e) The pressures of both gases are the same.
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