Question

For each of the following pairs of substances, indicate which will have the higher enthalpy of...

For each of the following pairs of substances, indicate which will have the higher enthalpy of fusion or vaporization. Explain your choice.

Vaporization:

H2O vs CH4

CH3CH2OH vs CH3OCH3

CH3CH2CH3 vs CH3CH2CH2CH3

Fusion:

H2O vs NaCL

NaCl vs MgO

C12H22O11 vs CaCl2

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Homework Answers

Answer #1

H2O has higher enthalpy of vapourization than CH4 because H2O contain strong intermolecular interaction than cH4.

CH3CH2OH has higher enthalpy of vapourization because of stronger intermolecular interaction.

CH3CH2CH2CH3 has higher enthalpy of vapourization because higher molar mass.

fusion:

NaCl has higher enthalpy of fusion because it is ionic solid.

MgO has higher heat of fusion than NaCl. because MgO has strong ionic interaction than NaCl

CaCl2 has higher enthalpy of fusion because it is ionic compound.

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