-0.0146KJ /g 432-50.0--6.8.× 50.0g x4.18579°C-F1420J C. How much energy is lost by the water when it cools from 50.0°C to 43.2°C? d. What is the heat of fusion of lauric acid (in kJ/g)? AT : e. What is the molar heat of fusion of lauric acid (kJ/mol)?

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Chapter12: Solutions
Section: Chapter Questions
Problem 12.118QP
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How many moles of oxygen atoms are in a 50.0g sample of the compound?
C.
Imd FesS30a
9.03×10atoms O
391.919 FeasaOialmol FcaS301a |ImolO
4. 'In an experiment two students set out to determine the molar heat of fusion of lauric acid. The
melting point of lauric acid is 43.2°C and the specific heat is 2.01 J/g°C.
The students add a 20.0g sample of lauric acid at 25.0°C to a 50.0g sample of water at 50.0°C. 2
The temperature stabilizes at 43.2°C and the lauric acid completely melts.
2.
Draw a heating curve to represent the total change in energy for the lauric acid sample.
a.
43.2°C
Laso°c
b. How much energy is absorbed by the lauric acid when it heats from 25.0°C to 43.2°C?
3.2-25.0=18.2°Cr2015/9°C x20
%3D
%3D
Continued on b
Transcribed Image Text:How many moles of oxygen atoms are in a 50.0g sample of the compound? C. Imd FesS30a 9.03×10atoms O 391.919 FeasaOialmol FcaS301a |ImolO 4. 'In an experiment two students set out to determine the molar heat of fusion of lauric acid. The melting point of lauric acid is 43.2°C and the specific heat is 2.01 J/g°C. The students add a 20.0g sample of lauric acid at 25.0°C to a 50.0g sample of water at 50.0°C. 2 The temperature stabilizes at 43.2°C and the lauric acid completely melts. 2. Draw a heating curve to represent the total change in energy for the lauric acid sample. a. 43.2°C Laso°c b. How much energy is absorbed by the lauric acid when it heats from 25.0°C to 43.2°C? 3.2-25.0=18.2°Cr2015/9°C x20 %3D %3D Continued on b
Practice PFE- Chemistry 2022
C.
How much energy is lost by the water when it cools from 50.0°CTO 43.2°C?
d. What is the heat of fusion of lauric acid (in kJ/g)?
03D MPST+
e.
What is the molar heat of fusion of lauric acid (kJ/mol)?
+eneray(4432°C)
heatoffusion
eraufusion
=layricacid
%31
Transcribed Image Text:Practice PFE- Chemistry 2022 C. How much energy is lost by the water when it cools from 50.0°CTO 43.2°C? d. What is the heat of fusion of lauric acid (in kJ/g)? 03D MPST+ e. What is the molar heat of fusion of lauric acid (kJ/mol)? +eneray(4432°C) heatoffusion eraufusion =layricacid %31
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In question c, since the answer was confirmed to be -1420 J, why did you use a positive 1420 for the calculation in step 2? 

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