
Interpretation: The amount of heat required to melt a given amount of ethanol is to be calculated.
Concept introduction:
Enthalpy of fusion is defined as the heat change associated with the change in the

Answer to Problem 1STP
2.63 kJ
Explanation of Solution
ΔHfus of ethanol is given to be 4.93 kJ/mol
It is given that when 1 mol of ethanol melts at its freezing point, the energy required is 4.93 kJ
Given the amount of ethanol = 24.5 g
Moles of a substance is found by dividing the given amount of substance by the molecular mass of the substance.
moles of ethanol=given amount of ethanolMolar mass of ethanolmoles of ethanol=24.5g46.07 g/mol=0.532mol
To melt 1 mol of ethanol, the heat required is = 4.93 kJ
Thus, to melt 0.532mol of ethanol, the heat required is = 4.93 kJ1 mol×0.532 mol=2.63 kJ
Chapter 17 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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