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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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fodog414 fodog414
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9 years ago Edited: 9 years ago, fodog414
one more heat transfer question! I'm going to give it another go and post my results if anyone could point out where I mess up or if I'm correct,
Thank you!! Slight Smile

info for lead
boiling point = 1.740E3 °C   Hvap(1.740E3 °C) = 858.2 J/g
melting point = 328.0 °C   Hfus(328.0 °C) = 23.00 J/g
specific heat solid = 0.1300 J/g°C
specific heat liquid = 0.1380 J/g°C


A 22.60 g sample of liquid lead at 572.0 °C is poured into a mold and allowed to cool to 24.0 °C. How many kJ of energy are released in this process
Post Merge: 9 years ago

so, this is what i did

22.60 x .1380 x (328-572) -760.98

22.60 x -23= -519.8

22.60 x .1380 x (24-328)= -948.1152

added them all together to get -2228.9024 J then divided by a thousand to get kj

-2.229kj

Could anyone confirm the outcome?
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bio_manbio_man
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#1
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9 years ago
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fodog414 Author
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#2
9 years ago
Thank you bioman for including the explanation!
It really is helpful into nailing these kind of problems down !!:)
wrote...
#3
Educator
9 years ago
You're welcome.
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