Unless otherwise stated, the common room
temperature and pressure is at 25°C and 1 atmosphere, respectively. At this
temperature and pressure hydrogen chloride is expected to be in a gaseous state.
Since it is a diatomic molecule consisting of hydrogen and chlorine atoms, they
have weak forces of interaction between molecules resulting to an uncondensed
state at room temperature. If the atmosphere where is it suspended has
moisture, hydrogen chloride gas is expected to react with the moisture to form
fumes of hydrochloric acid.
