Calculations

Record the results

(1)Weight of crucible
(2) Weight of crucible and magnesium ribbon
(3) Weight of magesium ribbon
32.34 grams
32.74 grams
0.40 grams
(4) Weight of crucible and magnesium oxide
(5) Mass of oxygen that reacted
33.01 grams
(33.01 - 32.74) = 0.27 grams

 

Calculate the mole of magnesium metal (mass/molar mass) = 0.40/24 =0.017mole

Calculate the mole of oxygen that reacted (mass/molar mass) = 0.27/16 =0.017mole

Magnesium
:
Oxygen
Moles
0.017
:
0.017
Ratio
1
:
1
Simplest ratio
1
:
1

So for every one atom of magnesium one atom of oxygen is present

Now conduct your own investigation with your own sample (approximately 0.5 grams) of magnesium.

 

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