A scientist wants to raise the temperature of a 0.10-kilogram sample of glass from -45°C to 15°C. How much heat energy is required to produce this change in temperature?
Answer (2)
F or m u l a f or h e a t e n er g y : Q = m Cp ( T 2 − T 1 ) m − ma ss = 0 , 1 k g Cp − s p ec i f i c h e a t o f g l a ss = 800 k g C ∘ J T 2 = 1 5 ∘ T 1 = − 4 5 ∘ Q = 0 , 1 ∗ 800 ( 15 + 45 ) = 80 ∗ 60 = 4800 J 4800 J i s re q u i re d t o h e a t t hi s g l a ss .
To raise the temperature of a 0.10-kg glass sample from -45°C to 15°C, 4800 Joules of heat energy is required. This calculation uses the formula Q = m ⋅ C p ⋅ ( T 2 − T 1 ) where specific heat capacity for glass is assumed to be 800 J/kg°C. The total temperature change is 60°C leading to the total energy necessary being 4800 J.
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