Amount of heat released:
Heat is released when 25.0 gm of liquid copper at its freezing point of 1,085°C changes to solid is -5125 J
Given:
Mass of liquid copper, m= 25 gm
Latent heat of fusion of copper, L = 205.0 J/g
The amount of heat needed to change one gram of a substance from solid to liquid is known as the latent heat of fusion.
However, in this instance, it is necessary to determine the quantity of heat emitted when liquid copper solidifies.
So, L = -205.0 J/g
Calculation:
We may use the unitary approach to calculate the heat released when 25.0 grams of liquid copper solidify at 1,085°C, which is its freezing point.
So,
Q = L x m
Q = -205 J/g x 25 g
Q = -5125 J
So, the correct answer is b) -5,130 J, which is much nearest to -5125 J as we have calculated above.
Learn more about latent heat of fusion here,
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