11. Shown below is a phase diagram for a substance. Several points (A-F) are ind

Question

11. Shown below is a phase diagram for a substance. Several points (A-F) are indicated on the phase diagram. B D 1 atm Temperature I. ndicate the phases of matter present when the substance is at each point (A-E) on the phase diagram. Under standard atmospheric pressure (1 atm), does this substance boil or sublime? How can you tell? Which phase transition would occur if the substance were transitioned from the conditions at point D to the conditions at point F? Would this transition be endothermic or exothermic? Consider a sample of this substance at the pressure and temperature given by point A. Heat is added to the sample, but its temperature remains constant. Why did the temperature remain constant? What happened to the absorbed heat? IV. 12. When making a café latte, steam (that is, water in the gas phase) is added to milk until the mixture reaches 70.0°C. How many grams of 100.0°C steam must be added to 250 g of milk to heat it from 4.0°C to 70.0°C? Assume the heat capacity of milk is the same as for water Cm (ice) 37.6 J/(mol-K) Cm (water) = 75.2 /(mol-K) Cm (steam) 33.1 J/(mol-K) AHfus = 6.02 kJ/mol Hvap-40.67 kJ/mol

Explanation / Answer

11. The given curve is that of Triple Point curve for water.

1. A= Fusion Curve (Liquid and Solid)

B= Solid state

C= Sublimation Curve (Solid and Gas)

D= Liquid State

E= Boiling Curve (Liquid and Gas)

F= Gaseous State

2. At standard temperature 1 atm, the sample boils because the ! atm pressure line cuts the boiling curve and not the sublimation curve.

3. If transition was made from Point D to Point F, the liquid would convert completely into gaseous state

4. At point A, the substance is undergoing state transition fro solid to liquid. The heat supplied is the latent heat of fusion used to break down physical bonds in the material and thus the temperature does not rise

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