A student drops two metallic objects into a 120-g steel container holding 150g o
ID: 1452221 • Letter: A
Question
A student drops two metallic objects into a 120-g steel container holding 150g of water at 25°C. One object is a 160-g cube of copper that is initially at 70°C, and the other is a chunk of aluminum that is initially at 5.0°C. To the surprise of the student, the water reaches a final temperature of 25°C, precisely where it started. What is the mass of the aluminum chunk? A student drops two metallic objects into a 120-g steel container holding 150g of water at 25°C. One object is a 160-g cube of copper that is initially at 70°C, and the other is a chunk of aluminum that is initially at 5.0°C. To the surprise of the student, the water reaches a final temperature of 25°C, precisely where it started. What is the mass of the aluminum chunk?Explanation / Answer
apply the principle of calorimetry
as
heat lost by copper cube = heat gained by aluminum chunk
m1*s1*(t1 - t3) = m2*s2*(t3 - t2)
0.16*387*60 = m2*900*20
m2 = 206.4 g
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