Neco Model Questions Vol1 2020 Chemistry Question 33
Practice objective / multiple choice question 33 from the 2020 Neco Model Questions Vol1 Chemistry examination.
A 72.0 g mixture of two isomers of pentane - n‑pentane and isopentane (2‑methylbutane) - is burnt completely in excess O₂. The total heat released is 3.51 MJ. Standard enthalpies of combustion are \(\Delta_c H^{\circ}(\text{n‑pentane}) = -3509\ \text{kJ mol}^{-1}\) and \(\Delta_c H^{\circ}(\text{isopentane}) = -3520\ \text{kJ mol}^{-1}\). Determine the mass percentage of isopentane in the original mixture.
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About This Question
This is Neco Model Questions Vol1 2020 Chemistry Question 33. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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