Which of the following substances would release the most amount of heat when they cool from...
Which of the following substances would release the most amount of heat when they cool from 50oC to 25oC if you started with equal masses of each? :
Magnesium, 1.05 J/goC
Aluminum, 0.920 J/goC
Lead, 0.126 J/goC
Homework Answers
heat released(q) = m s ΔT
m is the mass
s is the specific gravity
ΔT is the change in temperature
So
Given
Temperature change is (50-25) oC = 25oC for all and also
equal masses
let mass be m
so
heat released(q) for Magnesium,( s = 1.05 J/goC)
q = m s ΔT
= m 1.05 J/goC 25oC
= 26.25m Joules
heat released(q) for Aluminum, (s=0.920 J/goC)
q = m s ΔT
= m 0.920 J/goC 25oC
= 23m Joules
heat released(q) for Lead, (s=0.126 J/goC)
q = m s ΔT
= m 0.126 J/goC 25oC
= 3.15m Joules
Hence
Magnesium releases most heat
Simply
As all mases and temperature change is equal
q = m s ΔT
depends on S
which has higher s releases most heat among others
so
Magnesium releases most heat
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