A 1 kg block of aluminum is heated at atmospheric pressuresuch that its temperat
ID: 1727129 • Letter: A
Question
A 1 kg block of aluminum is heated at atmospheric pressuresuch that its temperature increases from 22 oC to 40oC. What is the change in the internal energy (in J) ofthe block of aluminum?Hint: The block is doing no work and no work is done on theblock. So from the first law of thermodynamics (energyconservation) we have: Delta U (change in internal energy) = Delta Q (heat added ortaken out of the system) But Delta Q = specific heat of Al * mass of Al * Delta T So Delta U = c(Al) m(Al) Delta T
A 1 kg block of aluminum is heated at atmospheric pressuresuch that its temperature increases from 22 oC to 40oC. What is the change in the internal energy (in J) ofthe block of aluminum?
Hint: The block is doing no work and no work is done on theblock. So from the first law of thermodynamics (energyconservation) we have: Delta U (change in internal energy) = Delta Q (heat added ortaken out of the system) But Delta Q = specific heat of Al * mass of Al * Delta T So Delta U = c(Al) m(Al) Delta T
Explanation / Answer
Specific Heat of Al = .900J/gC mass = 1000g U = (.900j/gC)(1000g)(18C) U = 16200j
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