... is full and the flame is blue) 5. Lift the lid of the crucible periodically and make observations, to check the end point of the reaction, this would be shown by no light or smoke being given off. 6. At the end of the reaction stop heating the crucible and let it cool down. 7. Weigh the crucible, with lid and contents, again record the mass to 2 decimal places. (Difference between the mass of the empty crucible with lid and crucible with lid and contents) Results Table: Mass (g) A Crucible and lid 33.98 B Crucible, lid and reactant 34.11 C Crucible, lid and products 34.15 Mass Of Reactants = B - A = 0.13g Mass Of Products = C - A = 0.17g Magnesium + Oxygen Magnesium Oxide 2 Mg O 2 2 MgO Moles 2 1 2 Molar Mass 24.3g 32g 40.3g Reacting Mass 48.6g 32g 80.6g If we have 0.13g of magnesium; Magnesium Oxide = 0.13 48.6 X 80.6 = 0.2g I expect to find a result of the reaction 0.2 grams of magnesium oxide. Conclusion: Percentage Error: ...

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