The heat of fusion AH, of tetrahydrofuran (C,H,O) is 8.5 kJ/mol. Calculate the change in entropy AS when 946. g of tetrahydrofuran melts at – 108.5 °C. Be sure your answer contains a unit symbol and the correct number of significant digits.

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Chapter18: Thermodynamics And Equilibrium
Section: Chapter Questions
Problem 18.97QP: When 1.000 g of gaseous butane, C4H10, is burned at 25C and 1.00 atm pressure, H2O(l) and CO2(g) are...
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#1 Solve the problem, please read directions carefully.  Thumbs up if you do it correctly. Be sure to round your answer to the correct number of significant figures. Please see the example I provided in the screenshot.

The answer should be in this type of format with this unit symbol -- (example: 0.0057 kJ/K)

9.7 g
kJ
3.16
mol
The moles of methanol (in the second parentheses) are equal to the mass of
methanol divided by the molar mass of methanol.
1
32.0419 g·mol
0.9566... kJ
There are 2 significant digits in this calculated value, but keep 2 extra digits for
now.
ow you must stop and think carefully about the sign of Q. Use the fact that heat is defined to be positive if the energy of the system
creases, and negative if the energy of the system decreases.
this case, energy must flow into the system for the CH,OH to melt, so Q must be positive:
Q= 0.9566 kJ
bu're next step is to divide Q by the temperature. Be careful! You need to use the absolute temperature, in kelvins:
There is 1 significant decimal place in this calculated value, but keep all of the
T=(-98.0+273.15) K=175.15 K
decimal places for now.
ow you're ready to use the Clausius equation:
0.9566 kJ
kJ
= 0.005462...
K
AS=
175.15 K
ince there were 2 significant digits in your calculated value for Q and 4 significant digits in the absolute temperature, you should
ound your final answer to 2 significant digits.
Transcribed Image Text:9.7 g kJ 3.16 mol The moles of methanol (in the second parentheses) are equal to the mass of methanol divided by the molar mass of methanol. 1 32.0419 g·mol 0.9566... kJ There are 2 significant digits in this calculated value, but keep 2 extra digits for now. ow you must stop and think carefully about the sign of Q. Use the fact that heat is defined to be positive if the energy of the system creases, and negative if the energy of the system decreases. this case, energy must flow into the system for the CH,OH to melt, so Q must be positive: Q= 0.9566 kJ bu're next step is to divide Q by the temperature. Be careful! You need to use the absolute temperature, in kelvins: There is 1 significant decimal place in this calculated value, but keep all of the T=(-98.0+273.15) K=175.15 K decimal places for now. ow you're ready to use the Clausius equation: 0.9566 kJ kJ = 0.005462... K AS= 175.15 K ince there were 2 significant digits in your calculated value for Q and 4 significant digits in the absolute temperature, you should ound your final answer to 2 significant digits.
The heat of fusion AH, of tetrahydrofuran (C¸H¿O) is 8.5 kJ/mol. Calculate the change in entropy AS when 946. g of tetrahydrofuran melts at – 108.5 °C.
Be sure your answer contains a unit symbol and the correct number of significant digits.
Ox10
Transcribed Image Text:The heat of fusion AH, of tetrahydrofuran (C¸H¿O) is 8.5 kJ/mol. Calculate the change in entropy AS when 946. g of tetrahydrofuran melts at – 108.5 °C. Be sure your answer contains a unit symbol and the correct number of significant digits. Ox10
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