Question

What is the total energy in kj lost when 10 grams of benzene is condensed at...

What is the total energy in kj lost when 10 grams of benzene is condensed at 80.1 degrees Celsius, cooled to a melting point of negative 5.1 degrees Celsius and frozen to a solid. Heat of Fusion for benzene= 128 J/g, Heat of Evaporation for benzene= 395 J/g, Specific Heat of benzene= 1.95 J/g degree Celsius

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Homework Answers

Answer #1

Ti = 80.1

Tf = -5.1

Lv = 395.0 J/g

Heatreleasedto convert gas to liquid at 80.1 oC

Q1 = m*Lv

= 10.0g *395.0 J/g

= 3950 J

Cl = 1.95 J/g.oC

Heat released to convert liquid from 80.1 oC to -5.1 oC

Q2 = m*Cl*(Ti-Tf)

= 10 g * 1.95 J/g.oC *(80.1--5.1) oC

= 1661.4 J

Lf = 128.0 J/g

Heat released to convert liquid to solid at -5.1 oC

Q3 = m*Lf

= 10.0g *128.0 J/g

= 1280 J

Total heat released = Q1 + Q2 + Q3

= 3950 J + 1661.4 J + 1280 J

= 6891.4 J

Answer: 6891.4 J

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