JEE Main 2017 Chemistry question
Given: kJ mol; kJ mol; kJ mol. Based on the above thermochemical equations, the value of at K for the reaction will be:
Answer: (2)
Solution
Apply Hess's law by adding the given equations so that the intermediates cancel. Take equation (i) once, equation (ii) twice, and equation (iii) once:
C + \mathrm{} &→ \mathrm{} && -393.5 2\mathrm{} + \mathrm{} &→ 2\mathrm{} && 2×(-285.8) = -571.6 \mathrm{} +
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