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Sagot :
To reverse the given reaction, we need to change the direction of the reaction, which in turn will change the sign of the enthalpy change (ΔH). The given reaction is:
[tex]\[ \ce{C2H4 + 3 O2 -> 2 CO2 + 2 H2O} \quad (\Delta H = -1410 \text{ kJ}) \][/tex]
When we reverse this reaction, the reactants become products and the products become reactants. The reversed reaction is:
[tex]\[ \ce{2 CO2 + 2 H2O -> C2H4 + 3 O2} \][/tex]
For the enthalpy change associated with the reverse reaction, the sign of ΔH will change. Therefore, the enthalpy change for the reversed reaction becomes:
[tex]\[ \Delta H = +1410 \text{ kJ} \][/tex]
Thus, the final value for the enthalpy of reaction you use for this reversed intermediate reaction is:
[tex]\[ \boxed{1410 \text{ kJ}} \][/tex]
So, the correct answer is B. 1410 kJ
[tex]\[ \ce{C2H4 + 3 O2 -> 2 CO2 + 2 H2O} \quad (\Delta H = -1410 \text{ kJ}) \][/tex]
When we reverse this reaction, the reactants become products and the products become reactants. The reversed reaction is:
[tex]\[ \ce{2 CO2 + 2 H2O -> C2H4 + 3 O2} \][/tex]
For the enthalpy change associated with the reverse reaction, the sign of ΔH will change. Therefore, the enthalpy change for the reversed reaction becomes:
[tex]\[ \Delta H = +1410 \text{ kJ} \][/tex]
Thus, the final value for the enthalpy of reaction you use for this reversed intermediate reaction is:
[tex]\[ \boxed{1410 \text{ kJ}} \][/tex]
So, the correct answer is B. 1410 kJ
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