Calculations Lab: Heats of Fusion and Vaporization

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SUMMARY

The discussion focuses on calculating the heats of fusion and vaporization, specifically addressing Question #3 from a homework assignment. The user converted grams to kilograms and utilized the correct order of operations in their calculations. The final answer presented was 1827.88 cal/g, but feedback indicated that the units should be clarified, suggesting the use of kcal/kg or cal/g instead. The final result must be expressed in appropriate heat transfer units, either Joules or calories.

PREREQUISITES
  • Understanding of heat transfer concepts, specifically heats of fusion and vaporization.
  • Familiarity with unit conversions between grams and kilograms.
  • Knowledge of basic algebra and order of operations in calculations.
  • Proficiency in using calorimetry units, specifically calories and Joules.
NEXT STEPS
  • Review the principles of calorimetry and the significance of heats of fusion and vaporization.
  • Learn about unit conversions between calories and Joules for heat transfer calculations.
  • Explore the differences between kcal/kg and cal/g in the context of thermal energy.
  • Practice solving similar problems involving heat transfer and unit conversions.
USEFUL FOR

Students studying thermodynamics, chemistry, or physics, particularly those working on calorimetry problems and heat transfer calculations.

pmalayavech
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Homework Statement



Hi, I am answering Question #3, and using the formula and variables above scratch area as reference on how to answer the question.

Could someone please have a look and see if the problem I worked out came out correct.

Homework Equations


The Attempt at a Solution


First I converted g = kg
I used the given variables, then I work out the problem, I made sure to do the paranthesis first before multiplying the variables in,
then converted back to kg and finally came with the answer

1827.88 cal/g heat transfer, did i use the correct unit? joules?
Any input would happily appreciated
12-04-2012101319PM.jpg
 
Last edited:
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You're answer is in the right ballpark (but a bit low). You've specified your heats of fusion and vaporization with units of cal/kg, whereas the number magnitudes look like they're more suited to being kcal/kg or cal/g. Check them.

The final result should have units pertaining to heat only: either Joules or calories.
 
ok thanks,
 

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