2.4. Reacting masses and volumes (of solutions and gases)
A subsection of Chemistry, 9701, through 2. Atoms, molecules and stoichiometry
Listing 10 of 98 questions
A white powder is known to be a mixture of magnesium oxide and aluminium oxide. 100 cm3 of 2 mol dm–3 NaOHis just sufficient to cause the aluminium oxide in x grams of the mixture to dissolve. The reaction occurring is Al 2O3 + 2OH– + 3H2O → 2Al (OH)4 –. 800 cm3 of 2 mol dm–3 HCl is just sufficient to cause all of the oxide in x grams of the mixture to dissolve. The reactions occurring are Al 2O3 + 6H+ → 2Al 3+ + 3H2O and MgO + 2H+ → Mg2+ + H2O. How many moles of each oxide are present in x grams of the mixture?
9701_s16_qp_11
MCQ
2016
Paper 1, Variant 1
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98