Can someone help me with #10 and 11. Also, can you tell me if I did #6 correct?

Question

Can someone help me with #10 and 11. Also, can you tell me if I did #6 correct?

Heot 9. what phase change is occurring when pressure and temperature change from: Using the phase diagram at right for an unknown substance, a to b !.fusion f to d 10. Using the phase diagram shown at right, estimate the normal boiling point of the unknown substance. s0 150 250 11. Challenge (extra credit): The chlorofluorocarbon CClF2 (Freon; MW-120.91 g/mol was once used as a refrigerant. Cooling comes from the evaporation of the refrigerant. Calculate the mass of CC,F2that must evaporate in order to water initially at+10 C. The heat of vaporization, AHp, of CC,Fis 34.94kJ/mol. (Hint It will be helpful to remember the first law of th freeze 18.00 g of - Energy is conserved)

Explanation / Answer

Ans 6

Normal boiling point occurs at atmospheric pressure

Atmospheric Pressure = 1 atm

At vapor pressure = 760 torr

Boiling point = 100°C

When vapor pressure = 564 torr

From the graph

Boiling point = 93°C (approx)

Ans 10

Normal boiling point occurs at atmospheric pressure

Atmospheric Pressure = 1 atm

Boiling point will lie on CD curve

CD curve represents the equilibrium curve of vapor liquid equilibrium

Boiling point = 300°C (approx)

Ans 11

Energy conservation

Heat given by water = heat absorbed by freon

Mass of water x Cp x (T2-T1) + mass of water x latent heat of fusion = mass of freon x heat of vaporization

18 g x 4.184 J/gC x (10 - 0) + 18 g x 334 J/g = mass x (34.94 x 1000 J/mol) /(Molecular weight)

6765.12 = mass x (34940 J/mol) / (120.91 g/mol)

Mass of freon = 23.41 g

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