The enthalpy of combustion of propance `(C_(3)H_(8))` gas in temes of given of geven data is , Bond energy (kJ/mol)
`underset(+x_(1))(.^(epsi)C-H)underset(+x_(2))(.^(epsi)O-O)underset(+x_(3))(.^(epsi)C-O)underset(+x_(4))(.^(epsi)O-H)underset(+x_(5))(.^(epsi)C-C)`
[Resonance energy of `CO_(2)` is -z KJ/mol and `DeltaH_("vaporization")[H_(2)O(l)" is y " KJ//mol]`

Options

A. `8x_(1)+2x_(5)+5x_(2)-6x_(3)-8x_(4)-4y-3z`
B. `6x_(1)+x_(5)+5x_(2)-3x_(3)-4x_(4)-4y-3z`
C. `8x_(1)+2x_(5)+5x_(2)-6x_(3)-8x_(4)-y-z`
D. `8x_(1)+x_(5)+5x_(2)-6x_(3)-8x_(4)-4y+3z`

Answer

A

Explanation

`C_(3)H_(8)(g)+5 O_(2)(g)rarr3 CO_(2)(g)+4H_(2)O(l)`
`Delta_(C)H=[(8xxB.E.(C-H)),(+2xxB.E.(C-C)),(+5xxB.E.(O=O))]`
`-[(6xxB.E. (C=O)),(+8xxB.E.(O-H)),(+3xx|R.E.|" of "CO_(2)),(+4xxDelta_("vap")H(H_(2)O))]`