1.

Calculate the enthalpy of formation of acetic acid from the following data.CH_(3)COOH(l)+2O_(2)(g)rarr 2CO_(2)(g)+2H_(2)O(l),"" Delta H=-207.9 k cal

Answer»

Solution :The required equation is ,
`2C(s)+2H_(2)(g)+O_(2)(g)to CH_(3)COOH(l), "" Delta H=?`
This equation can be obtained by multiplying equation (II) by 2 and also equation (iii) by 2 and adding both and finallysubtracting equation (i).
`2C(s)+2O_(2)(g)+2H_(2)(g)+O_(2)(g)-CH_(3)COOH(l)-2O_(2)(g)to 2CO_(2)(g)+2H_(2)O(l)-2CO_(2)(g)-2H_(2)O(l)`
`2C(s)+2H_(2)(g)+O_(2)(g)to CH_(3)COOH(l)`
`Delta_(f)H[CH_(3)COOH(l)=2xx(-94.48)+2xx(-68.4)-(-207.9)`
`=-188.96-136.8+207.9`
`=-325.76=-117.86` k cal.


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