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Compute the heat of formation of liquie ...

Compute the heat of formation of liquie methyl alcohol is kilojoule per mol using the following data. Heat of vaporisation of liquid methyl alcohol `=38kJ//mol`. Heat of formation of gaseous atoms from the elements in their standard states `:H=218kJ // mol, C=715kJ //mol, O=249kJ //mol.`
Average bond energies`:`
`C-H415kJ//mol, C-O 356kJ//mol, O-H 463kJ //mol.`

Text Solution

Verified by Experts

`C_((s))+2H_(2(g))+(1)/(2)O_(2(g)) rarr CH_(3)OH_((l)), DeltaH=?`
`DeltaH=` Bond energy data for formation `+` Bond energy data for dissociation `+` Energy released during liquefaction
`=-[3C-H+1C-O+1O-H]+[C_(srarrg)+2H-H+(1)/(2)O-O]-[CH_(3)OH_((g))rarr CH_(3)OH_((l))]`
`=-[3xx415+356+463]+[715+2xx436+(1)/(2)xx249]-38`
`=-266kJ mol^(-1)`
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Compute the heat of formation of liquid methyl alcohol in kJ mol^(-1) , using the following : Heat of vaporisation of liquid methyl alcohol =38 kJ mol^(-1) . Heat of formation of gaseous atoms from the elements in their standard states : H, 218 kJ//mol , C,715 kJ // mol, O, 249 kJ //mol . Averagebond energies : C-H, 415 kJ //mol ,C-O kJ //mol, O-H, 463 kJ //mol

Compute the heat of formation of liquid methyl alcohol in kilojoules per mole using the following data. The heat of vaporisation of liquid methyl alcohol =38 "kJ/mole" . The heats of formation of gaseous atoms from the elements in their standard states: H,218 "kJ/mole", C,715 "kJ/mole", O, 249 "kJ/mole" . Average bond energies : C-H=415 "kJ/mole" C-O=356 "kJ/mole" O-H=463 "kJ/mole" .

Knowledge Check

  • Calculate the enthalpy of formation of methanol (DeltaH_(f) (CH_(3) OH) (I) ) in KJ mol^(-1) using the data : DeltaH_("vap") (CH_(3)OH)(I) is 38 KJ mol^(-1) The heat of formation of gaseous atoms from elements in their standard states are H = 218 KJ mol^(-1) C = 715 KJ mol^(-1) O = 249 KJ mol^(-1) Average bond energy data is C- H= 415 KJ mol^(-1) C-O = 356 KJ mol^(-1) O -H = 463 KJ mol^(-1)

    A
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    B
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    C
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  • The Standard heat of formation of carbon atom gaseous state in KJ/mol is: DeltaH^(@)("atomisation of CO gas")=1072KJ//mol DeltaH^(@)("formation of 'O' gas")=247KJ//mol DeltaH^(@)("formation of CO gas")=-114KJ//mol

    A
    400
    B
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    C
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    Compute the heat of formation of liquid methyl alcohol in kilo joules per mole using the following data : Heat of vaporisation of liquid methyl alcohol : 38 kJ/mol. Heat of formation of gaseous atoms from the elements in their standard states : H = 218 kJ/mol, C = 715 ("kJ")/("mol")= and O = 249 ("kJ") /("mol") . Average bond energies, C - H = 415 kJ/mol, C - O = 356 (kJ)/(mol) and O-H = 436 (kJ)/(mol).

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