Here are my Lab notes i have obtained, i answered everything in my homework but

Question

Here are my Lab notes i have obtained, i answered everything in my homework but these two questions which have me confused. Hope to get some help! Thanks

Experiment 1

Empty crucible weighs 88.000g

Crucible with 5g of magnesium weighs 93.000g

Placed crucible with 5g of magnesium on a Bunsen burner for 1-2 mins, removed and let cool for 1-2 mins. Crucible now weighs 96. 289g

Mass of empty crucible: 88.000g

Mass of Mg (g): 93.000g

Mass of "unknown" product after heating: 96.289g

Change in mass: 3.289g

Questions

1.) Where did the extra mass come from? (Hint: The final product is magnesium oxide)

2.) Write a balanced equation for the synthesis reaction that occurred.

Explanation / Answer

During this lab, Magnesium has reacted with Oxygen present in air to form Magnesium Oxide (MgO)

The increases in mass is due to combination of Magnesium with Oxygen

The balanced equation for this reaction is

2 Mg + O2 --> 2 Mg O

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