1.

Calculate the enthalpy of vapourisation of ethanol, given enthalpies of formation of liquid ethanol and gaseous ethanol as -277.6J and -235.4 kJ respectively.

Answer»

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SOLUTION :`DeltaH_(vap)=H_(p)-H_(R)`
`=-235.4kJ-(-277.6kJ)`
`=42.2kJ`


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