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VICChemistryQuick questions

Unit 1: How can the diversity of materials be explained?

Quick questions on Empirical and molecular formulae (VCE Chemistry Unit 1)

5short 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 is empirical formula?
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The simplest whole-number ratio of atoms in a compound. CH2_2O is the empirical formula for glucose, ethanal, methanal and many other compounds.
What is molecular formula?
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The actual number of each atom in a molecule. Glucose is C6_6H12_{12}O6_6, a multiple of the empirical CH2_2O.
What is q1?
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A compound contains 40.0%40.0\% C, 6.7%6.7\% H and 53.3%53.3\% O by mass. Determine its empirical formula. [2 marks]
What is q2?
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A hydrocarbon of molar mass 84 g/mol84 \, \text{g/mol} gives 264 mg264 \, \text{mg} of CO2\text{CO}_2 and 108 mg108 \, \text{mg} of H2O\text{H}_2 \text{O} from a 84.0 mg84.0 \, \text{mg} sample. (a) Determine the empirical formula. (b) Determine the molecular formula.
What is q3?
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An iron-oxide ore from Pilbara contains only Fe and O. A 2.000 g2.000 \, \text{g} sample produces 1.398 g1.398 \, \text{g} of Fe on reduction. (a) Calculate moles of Fe and O.

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