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29 January, 12:27

The enthalpy of fusion of methanol (CH3OH) is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol? 1. 2.52 kJ absorbed 2. 3.95 kJ absorbed 3. 0.253 kJ absorbed 4. 2.52 kJ released 5. 3.95 kJ released

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  1. 29 January, 14:16
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    There is 2.52 kJ of energy released (option 4)

    Explanation:

    Step 1: Data given

    The enthalpy of fusion of methanol (CH3OH) is 3.16 kJ/mol

    Mass of methanol = 25.6 grams

    Molar mass of methanol = 32.04 g/mol

    Step 2: Calculate moles of methanol

    Moles methanol = mass methanol / molar mass methanol

    Moles methanol = 25.6 grams / 32.04 g/mol

    Moles methanol = 0.799 moles

    Step 3: Calculate energy transfer

    Energy transfer = moles * enthalpy of fusion

    Energy = 0.799 moles * 3.16 kJ/mol

    Energy = 2.52 kJ released

    There is 2.52 kJ of energy released
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