A 50 gram sample of delicious pork rinds is placed in an open, constant pressure
ID: 482735 • Letter: A
Question
A 50 gram sample of delicious pork rinds is placed in an open, constant pressure calorimeter that contains 3000 grams of water. The temperature of the water increases by 47C when the pork rinds are combusted. The heat capacity of water is 4.184 J/g C. Assume the heat lost to the calorimeter itself or to the air is negligible. Which of the following is correct for the SYSTEM?
1.) U = +590 kJ
2.) U = 11.8 kJ
3.) H = 11.8 kJ
4.) H = +590 kJ
5.) U = 590 kJ
6.) H = +11.8 kJ
7.) U = +11.8 kJ
8.) H = 590 kJ
Explanation / Answer
for ther water
q= m C T and q = delta H
q = 3000 grams ( 4.184 J/g-C) (47 C)
q = 589944 joules
q = 589.944 kiloJoules
q ( @ 3 sig figs) = 590 kJ gained by the water.
which equals -590kJ lost by the pork
your answer is: #8. delta H = -590 kJ
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