A-LevelChemistryAtoms, molecules and stoichiometryMay/June 2011Paper 1 Q111 Mark
0.144 g of an aluminium compound X react with an excess of water, to produce a gas. This gas burns completely in O2 to form H2O and 72 cm³ of CO2 only. The volume of CO2 was measured at room temperature and pressure. What could be the formula of X? [C = 12.0, Al = 27.0; 1 mole of any gas occupies 24 dm³ at room temperature and pressure]
AAl2C3
BAl3C4
CAl4C3
DAl5C3
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The correct answer is C. This question tests the candidate's understanding of atoms, molecules and stoichiometry 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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