QUESTION 3 What is the change in internal energy in joules for a system that releases 154 J of heat and does 125 J of work on its surroundings? O 279 J 29 J O 1.23 J -29 J O -279J O O O O O

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QUESTION 3
What is the change in internal energy in joules for a system that releases 154 J of heat and does 125 J of work on its surroundings?
O 279 J
29 J
O 1.23 J
-29 J
O -279 J
QUESTION 4
A 307-g sample of an unknown mineral was heated to 98.7°C and placed into a calorimeter containing 72.4 g of water at 23.6°C. The heat capacity of the calorimeter was 15.7 J/°C. The final
temperature in the calorimeter was 32.4°C. What is the specific heat capacity of the mineral?
O 0.138 J/g-°C
O 0.131 J/g.°C
O 0.124 J/g-°C
O 0.145 J/g-°C
O None of these choices is correct.
Transcribed Image Text:QUESTION 3 What is the change in internal energy in joules for a system that releases 154 J of heat and does 125 J of work on its surroundings? O 279 J 29 J O 1.23 J -29 J O -279 J QUESTION 4 A 307-g sample of an unknown mineral was heated to 98.7°C and placed into a calorimeter containing 72.4 g of water at 23.6°C. The heat capacity of the calorimeter was 15.7 J/°C. The final temperature in the calorimeter was 32.4°C. What is the specific heat capacity of the mineral? O 0.138 J/g-°C O 0.131 J/g.°C O 0.124 J/g-°C O 0.145 J/g-°C O None of these choices is correct.
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