Shown below is a phase diagram for sulfur (not drawn to scale). Sulfur can exist in solid modifications, rhombic and monoclinic, denoted by S_R and S_M, respectively. Which of the following statements is incorrect? A) At pressures close to 1 atm, rhombic sulfur can be in stable equilibrium with liquid sulfur. B) Under ordinary atmospheric conditions (at sea level), sulfur does not sublime. C) This system has two triple points. D) At a given pressure, there is (at most) one temperature at which rhombic sulfur can exist in equilibrium with monoclinic sulfur. E) None of these statements is incorrect.

Question

Quizplus · Accepted Answer

At pressures close to 1 atm, monoclinic sulfur can be in stable equilibrium with liquid sulfur, not rhombic sulfur. This is because the line between the liquid and monoclinic sulfur regions has a positive slope, indicating that an increase in pressure will favor the formation of monoclinic sulfur over rhombic sulfur. Therefore, statement A is incorrect.

Shown Below Is a Phase Diagram for Sulfur (Not Drawn