Which of the following substances is most likely to be a gas at room temperature and atmospheric pressure?

Question

Quizplus · Accepted Answer

The substance with the highest likelihood to be a gas at room temperature and atmospheric pressure would need to have very weak or non-existent intermolecular forces. The only substance listed that is a gas at room temperature and atmospheric pressure is COS (carbonyl sulfide). The other options, Ni (nickel), Hg (mercury), CS (cesium), and CBr (carbon bromide), are solids or liquids at room temperature and atmospheric pressure.

Which of the Following Substances Is Most Likely to Be