Neco 2022 Chemistry Question 29
Practice objective / multiple choice question 29 from the 2022 Neco Chemistry examination.
A hydrocarbon has an empirical formula \(\mathrm{CH_2}\) and a molar mass of 84\,\text{g mol}^{-1}. (i) Write its molecular formula. (ii) Using the average bond enthalpies: C-C 348\,\text{kJ mol}^{-1}, C-H 413\,\text{kJ mol}^{-1}, O=O 498\,\text{kJ mol}^{-1}, C=O (in \(\mathrm{CO_2}\)) 799\,\text{kJ mol}^{-1}, O-H 463\,\text{kJ mol}^{-1}, calculate the standard heat of combustion \(\Delta_cH^{\circ}\) per mole for the complete combustion reaction \(\mathrm{C_6H_{12}} + 9\ \mathrm{O_2} \rightarrow 6\ \mathrm{CO_2} + 6\ \mathrm{H_2O}\). Express the result in kJ\,\text{mol}^{-1} (negative sign indicates exothermic).
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About This Question
This is Neco 2022 Chemistry Question 29. It is one of the objective questions from the 2022 Neco Chemistry examination.
Difficulty level: Medium .
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