8/19/2019 Revision as Energetic

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Energetic/Summary/Revision AS Chemistry

3 Propanone is a liquid.

The equation for the complete comustion of propanone is!

C"3C#C"3 $l% & '#( $g% 3C#( $g% & 3"(# $l%

(a) )sing the ond energies from the  Data Booklet * calculate a value for the standard

enthalpy change for this reaction. +3,

  (b) The standard enthalpy change of comustion of propanone is -0.1 2 mol-.

Suggest 4hy this value differs from the value otained using ond energies. +,

  (c) The standard enthalpy change of formation of propanone is -(' 2 mol-.

(i) 5rite the equation 4hich descries the standard enthalpy change of formation of 

 propanone. +,

(ii) E6plain 4hy the enthalpy change of formation of propanone cannot e found y a

single e6periment. +,

 +Total! ,

'. )se the follo4ing standard enthalpy changes of comustion* to calculate the enthalpy

change

of formation of ethane!

  / 2mol-

caron -373

hydrogen -(0

ethane -108

+Total! 3,

(