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VICChemistryQuick questions

Unit 3: How can design and innovation help to optimise chemical processes?

Quick questions on Fuels, energy content and energy density: VCE Chemistry Unit 3

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are comparing fuels?
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The "best" fuel depends on the application.
What is q1?
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Distinguish between energy content and energy density of a fuel. Give units for each and an example. [3 marks]
What is q2?
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Methane has ΔHc=−890 kJ/mol\Delta H_c = -890 \, \text{kJ/mol}. (a) Calculate the energy content in kJ/g\text{kJ/g}. (b) Calculate the mass of CH4\text{CH}_4 needed to heat 200 L200 \, \text{L} of water from 1515 to 40∘C40^{\circ}\text{C} assuming 60%60\% efficiency.
What is q3?
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Compare brown coal, natural gas and bioethanol. (a) Rank by energy content (kJ/g). (b) Compare CO2\text{CO}_2 per kJ.

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