Combustion of 1 mole of benzene is expressed at C₆ H₆(l)+15/2 O₂(~g) → 6 CO₂(~g)+3 H₂ 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 C₆ H₆(l), for the reaction 6 C (graphite) +3 H₂(g) → C₆ H₆(l) is 48.5 ~kJ ~mol⁻¹. 2. Standard Enthalpy of formation of 1 ~mol of CO₂(g), for the reaction C (graphite) +O₂(g) → CO₂(g) is -393.5 ~kJ ~mol⁻¹. 3. Standard and Enthalpy of formation of 1 ~mol of H₂ O(l), for the reaction H₂(g)+1/2 O₂(g) → H₂ O(l) is -286 ~kJ ~mol⁻¹.

JEE Main 2024 Chemical Thermodynamics Question with Answer (5 Apr Evening shift, Q22)

JEE Main 20245 Apr, Evening shiftChemistryHardChemical Thermodynamics84× since 2002

Combustion of 1 mole of benzene is expressed at

\mathrm{C}_6 \mathrm{H}_6(\mathrm{l})+\frac{15}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_2(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \text {. }

The standard enthalpy of combustion of

2 \mathrm{~mol}

of benzene is

-^{\prime} x^{\prime} \mathrm{kJ}

x=

__________. Given : 1. standard Enthalpy of formation of

1 \mathrm{~mol}

\mathrm{C}_6 \mathrm{H}_6(\mathrm{l})

, for the reaction

6 \mathrm{C}

(graphite)

+3 \mathrm{H}_2(\mathrm{g}) \rightarrow \mathrm{C}_6 \mathrm{H}_6(\mathrm{l})

48.5 \mathrm{~kJ} \mathrm{~mol}^{-1}

. 2. Standard Enthalpy of formation of

1 \mathrm{~mol}

\mathrm{CO}_2(\mathrm{g})

, for the reaction

\mathrm{C}

(graphite)

+\mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{CO}_2(\mathrm{g})

-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}

. 3. Standard and Enthalpy of formation of

1 \mathrm{~mol}

\mathrm{H}_2 \mathrm{O}(\mathrm{l})

, for the reaction

\mathrm{H}_2(\mathrm{g})+\frac{1}{2} \mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{l})

-286 \mathrm{~kJ} \mathrm{~mol}^{-1}

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