The graph shows isotherms of a gas plotted from van der Waal's equation. At which point is a mixture of liquid and vapor likely to be found?
A) 1
B) 2
C) 3
D) 4
E) 5

Question

The graph shows isotherms of a gas plotted from van der Waal's equation. At which point is a mixture of liquid and vapor likely to be found?
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Quizplus · Accepted Answer

A mixture of liquid and vapor is likely to be found at the point where the isotherm intersects the region of negative curvature. This occurs at point 2 on the graph. At this point, the slope of the isotherm is decreasing, indicating that the gas is undergoing a phase change from vapor to liquid.

The Graph Shows Isotherms of a Gas Plotted from Van