Igcse Model Questions Vol1 2019 Chemistry Question 39
Practice objective / multiple choice question 39 from the 2019 Igcse Model Questions Vol1 Chemistry examination.
The combustion of liquid octane (\(C_8H_{18(l)}\)) follows \(C_8H_{18(l)} + 12.5 O_2(g) \rightarrow 8 CO_2(g) + 9 H_2O(l)\). Given standard enthalpies of formation: \(\Delta H_f^\circ(C_8H_{18(l)}) = -250\) kJ mol⁻¹, \(\Delta H_f^\circ(CO_2(g)) = -393.5\) kJ mol⁻¹, \(\Delta H_f^\circ(H_2O(l)) = -285.8\) kJ mol⁻¹, and \(\Delta H_f^\circ(O_2(g)) = 0\). Calculate the amount of energy released (in kJ) when 2.00 g of octane is completely combusted.
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About This Question
This is Igcse Model Questions Vol1 2019 Chemistry Question 39. It is one of the objective questions from the 2019 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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