Combustion of 1 mole of benzene is expressed at {\C}_6 {\H}_6(1)+\frac{15}{2} {\O}_2( {\g}) \rightarrow {\CO}_2( {\g})+3 {\H}_2 {\O}(1) \text{. } The standard enthalpy of combustion of 2 {\mol} of benzene is - ' x ' {\kJ}. {\x}= _______. (1) standard Enthalpy of formation of 1 {\mol} of {\C}_6 {\H}_6(1), for the reaction 6 {\C} (graphite) +3 {\H}_2( {\g}) \rightarrow {\C}_6 {\H}_6(1) is 48.5 {\kJ} {\mol}^{-1}. (2) Standard Enthalpy of formation of 1 {\mol} of {\CO}_2( {\g}), for the reaction {\C} (graphite) + {\O}_{2( {\g})} \rightarrow {\CO}_2( {\g}) is -393.5 {\kJ} {\mol}^{-1}. (3) Standard and Enthalpy of formation of 1 {\mol} of {\H}_2 {\O}(1), for the reaction {\H}_2( {\g})+\frac{1}{2} {\O}_2( {\g}) \rightarrow {\H}_2 {\O}(1) is -286 {\kJ} {\mol}^{-1}. [5 Apr 2024 Shift 2]

Chemical Thermodynamics Part 2

Section: Chemistry

Question : 28 of 100

Marks: +1, -0

Combustion of 1 mole of benzene is expressed at
C6H6(1)+‌

O2(g)⟶CO2(g)+3H2O(1)‌. ‌
The standard enthalpy of combustion of 2‌mol of benzene is - ' x ' kJ.
x= _______.
(1) standard Enthalpy of formation of 1‌mol of C6H6(1), for the reaction
6C (graphite) +3H2(g)⟶C6H6(1) is 48.5‌kJ‌mol−1.
(2) Standard Enthalpy of formation of 1‌mol of CO2(g), for the reaction
C (graphite) +O2(g)⟶CO2(g) is −393.5‌kJ‌mol−1.
(3) Standard and Enthalpy of formation of 1‌mol of H2O(1), for the reaction
H2(g)+‌

O2(g)⟶H2O(1) is −286‌kJ‌mol−1.

[5 Apr 2024 Shift 2]

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