A sealed flask at constant temperature contains iodine crystals and iodine vapor
CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
A sealed flask at constant temperature contains iodine crystals and iodine vapor. The vapor pressure is monitored after the flask is closed.
Which of the following observations is most consistent with the conclusion that the system has attained equilibrium?
(a) The vapor pressure increases and eventually levels off only after all of the solid iodine has disappeared.
(b) The vapor pressure rises at first and then remains constant while some solid iodine is still present.
(c) The vapor pressure remains constant once the mass of iodine vapor equals the mass of solid iodine.
(d) The vapor pressure rises rapidly at first, then continues to increase slowly while solid iodine is still in the flask.