31a. The reaction in (a) was carried out in a crucible with a lid and the following data was recorded. Calculate the
amount of magnesium, in mol, that was used. [1 mark]
Mass of crucible and lid = 47.372 ±0.001 g
Mass of crucible, lid and magnesium ribbon before heating = 53.726 ±0.001 g
Mass of crucible, lid and product after heating = 56.941 ±0.001 g
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