CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
Iron reacts with chlorine to form iron(III) chloride, . A student heats 5.6 g of iron powder with 3.55 g of chlorine gas and collects the product. Suggest, without calculating any numerical answer, how the student could use the masses of the two reactants to decide which reagent is in excess.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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