Question

At \(300\,\mathrm{K}\), the enthalpies of formation of \(\mathrm{C_6H_5COOH(s)}\), \(\mathrm{CO_2(g)}\), and \(\mathrm{H_2O(l)}\) are \(-409\), \(-393\), and \(-286\,\mathrm{kJ\,mol^{-1}}\), respectively. 
The enthalpy of combustion of benzoic acid (in \(\mathrm{kJ\,mol^{-1}}\)) is

• A. \(-1600\)
• B. \(+1600\)
• C. \(-3200\)
• D. \(+4800\)

Hint:

For any reaction, \[ \boxed{ \Delta H_{\text{reaction}} = \sum \Delta H_f^\circ(\text{products}) - \sum \Delta H_f^\circ(\text{reactants}). } \] Remember that \[ \boxed{\Delta H_f^\circ(\mathrm{O_2})=0.} \]

Answer 1

The Correct Option is C