A-LevelChemistryChemical energeticsFeb/Mar 2019Paper 1 Q91 Mark
The equation for a chemical reaction is shown. All substances are in their standard states. XeF₆ + 3H₂O → XeO₃ + 6HF Which statement describes the standard enthalpy change of reaction for this reaction?
Athe enthalpy change when a total of one mole of products is produced
Bthe enthalpy change when a total of one mole of reactants is reacted
Cthe enthalpy change when one mole of water reacts
Dthe enthalpy change when six moles of hydrogen fluoride are produced
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The correct answer is D. This question tests the candidate's understanding of chemical energetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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