The enthalpy of fusion for Al is 10.7 kJ/mol. -12.2 kJ is the energy change when 30.8 g of Al solidifies at 660°C.
What is Enthalpy of Fusion ?
The amount of energy needed to change 1 mole of substance under state change at constant temperature and pressure is called enthalpy of fusion. It is also known as Latent heat of fusion. Unit of enthalpy of fusion is kJ/mol.
How to find the change in energy ?
To find the change in energy use this expression:
q = n ΔH
where
q = Energy change
n = number of moles
ΔH = Molar enthalpy
Number of moles (n) = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{30.8\ g}{26.98\ \text{g/mol}}[/tex]
= 1.141 mol
Now put the values in above formula we get
q = - n ΔH [Negative sign is used because Al solidifies here]
= - (1.141 mol × 10.7 kJ/mol)
= -12.2 kJ
Thus from the above conclusion we can say that The enthalpy of fusion for Al is 10.7 kJ/mol. -12.2 kJ is the energy change when 30.8 g of Al solidifies at 660°C.
Learn more about the Latent heat of fusion here: https://brainly.com/question/87248
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