The emperical formula of MgO

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The Empirical Formula of Magnesium Oxide

Data collection:

This table shows the mass of different chemicals:

Table (1): Raw data

Uncertainties:

  1. balance +/-0.01

Data processing and presentation:

Table (2)

Mass of Mg= (the mass of crucible lid +Mg) – (the mass of crucible lid) = 38.30- 38.12= 0.18

Mass of Oxygen= (the mass of crucible lid + contents after heating) – (the Mass of crucible lid+ Magnesium) =38.40- 38.30=0.10                                                        -3

Number of moles of Mg=0.18/24.31= 6.7 X10 moles

Number of moles of oxygen= 0.10/16.00 = 6.3 X10 moles

Ratio Mg/O =0.00699/ 0.00625 =1.11+0.1

The actual value of Mg/O=1.00

The experimental empirical formula

                    Mg                   O

                       6.7 X10            6.3 X10

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                       6.3 X10            6.3 X10

Mg   O

  1. 1

Magnesium oxide is made up of a ratio by mass of approximately 1:1 Magnesium to Oxygen, giving up an empirical formula of MgO.

Before adding water Magnesium oxide had a white appearance resembling bird droppings. This changed it to grey color like a cigarette ash.

Percentage Error = (moles of Oxygen- moles of Mg) x100%

                                 Moles of oxygen

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