First slide

Enthalpy of Combustion

Question

Given C + 2S → CS₂, $\large \Delta H_f^0\$ =+117.0 kJ mol^–1
C + O₂ → CO₂, $\large \Delta H_f^0\$ = – 393.0 kJmol–1
S + O₂ → SO₂, $\large \Delta H_f^0\$ = – 297.0 kJmol–1
The heat of combustion of CS₂ + 3O₂ → CO₂ + 2SO₂ is

Moderate

Solution

$\begin{array}{l} {\Delta _C}H(C{S_2}) = [{\Delta _f}H(C{O_2}) + 2{\Delta _f}H(S{O_2})] - [{\Delta _f}H(C{S_2}) + 3{\Delta _f}H({O_2})\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = [ - 393 + 2( - 297)] - [ + 117 + 3(0)]\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 393 - 594 - 117 = - 1104KJ/mole \end{array}$

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