The substance that releases 21.2 KJ of energy when 1.42 mol of it freezes is iron, Fe
Data obtained from the question
From the question given above, the following data were obtained from the question:
- Heat released (Q) = 21.2
- Mole of substance = 1.42 mole
How to determine the subtance
To determine the substance that will release 21.2 KJ of energy when 1.42 mole of it freezes, we shall shall determine the heat of fusion of the subtance. This can be obtained as illustrated below:
- Heat released (Q) = 21.2
- Mole of substance (n) = 1.42 mole
- Heat of fusion (ΔHf) =?
Q = n × ΔHf
Divide both sides by n
ΔHf = Q / n
ΔHf = 21.2 / 1.42
ΔHf = 14.9 KJ/mol
Comparing the heat of fusion of the substance obtained (14.9 KJ/mol) with those given in the table (see attached photo), we can conclude that the substance is iron, Fe
Learn more about heat transfer:
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Complete question
See attached photo
