An insulated container holds one mole of oxygen gas (O2, mass 32 g/mol) at a tem

Question

An insulated container holds one mole of oxygen gas (O2, mass 32 g/mol) at a temperature of 1000 K. An identical container holds one mole of steam (H2O, mass 18 g/mol) at the same temperature. The gases are ideal. Which of the following statements is FALSE?

A. The steam and the oxygen are at the same pressure.
B. The total energy of the steam is greater than that of the oxygen because H2O has more rotational and vibrational degrees of freedom than O2 does.
C. The rms velocity of each H2O molecule is 1.33 times that of each O2 molecule.
D. The average translational kinetic energy of each H2O molecule is greater than that of each O2 molecule.
E. It requires more energy to raise the temperature of the steam than it does to raise the temperature of the oxygen by the same amount.

Explanation / Answer

FALSE statements are:

D. The average translational kinetic energy of each H2O molecule is greater than that of each O2 molecule.

E. It requires more energy to raise the temperature of the steam than it does to raise the temperature of the oxygen by the same amount.

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