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Combustion of 1 mole of benzene is expressed at ( C ₆ H ₆( l )+ 15 2 O ₂( ~g ) 6 CO ₂( ~g )+3 H ₂ O ( l ) . ) The standard enthalpy of combustion of (2 ~mol ) of benzene is (-^ x^ kJ ). (x= ) ______ Given: 1. standard Enthalpy of formation of (1 ~mol ) of ( C ₆ H ₆( l ) ), for the reaction (6 C ) (graphite) (+3 H ₂( ~g ) C ₆ H ₆( l ) ) is (48.5 ~kJ ~mol ⁻¹ ). 2. Standard Enthalpy of formation of (1 ~mol ) of ( CO ₂(

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aligned & 6 C ( graphite )+3 H ₂( ~g ) C ₆ H ₆( ) ; H =48.5 ~kJ / mol & C ( graphite )+ O ₂( ~g ) CO ₂( ~g ) ; H =-393.5 ~kJ / mol & H ₂^ ( g ) + 1 2 ( ~g ) H ₂ O ( ) ; H =-286 ~kJ / mol & equation -(1) 1+(2) 6+(3) 3 & -48.5-6 393.5-3 286 & =-3267.5 ~kJ for 1 ~mol & =-6535 ~kJ for 2 ~mol & Ans. 6535 ~kJ aligned

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