Practise IB Chemistry SL 2.1 with questions that balance equations, calculate reacting quantities, identify limiting reactants and evaluate yield and atom economy.
Iron may be extracted from iron (II) sulfide, FeS.
The first step in the extraction of iron from iron (II) sulfide is to roast it in air to form iron (III) oxide and sulfur dioxide.
Write the equation for this reaction.
4FeS(s)+7O2( g)→2Fe2O3( s)+4SO2( g)
Marking guidance:
Accept any correct ratio.
The reaction between ethanoic acid and ethanol is homogeneous and reversible.
0.6 moles each of ethanol and ethanoic acid at 60∘C reacted in the presence of an acid catalyst. The volume remained constant. At equilibrium 0.2 moles of ethanoic acid remained in the reaction mixture.
Calculate the amounts, in mol, of ethanol, ethyl ethanoate and water at equilibrium.
«amount of» ethanol =0.2 «mol»
«amount of» ethyl ethanoate =0.4 «mol»
AND
«amount of» water =0.4 «mol»
Chlorine undergoes many reactions.
2.67 g of manganese(IV) oxide was added to 200.0 cm3 of 2.00moldmm−3HCl.
Determine the limiting reactant, showing your calculations.
《 nHCl=2.00 moldm−3×0.2000dm3 》 =0.400 mol
« 40.400= » 0.100 mol AND MnO2 is the limiting reactant
Marking guidance:
Accept other valid methods of determining the limiting reactant in M2.
Determine the excess amount, in mol , of the other reactant.
« 0.0307 mol×4=0.123 mol »
« 0.400 mol−0.123 mol= » 0.277 «mol»