The mass of MgO formed is 3.502 grams and mass of formed is 1.587 grams.
Explanation:
We are given:
Total mass of magnesium reacted = 3.26 g
Total mass of products formed = 5.09 g
To calculate number of moles of a substance, we use the equation:
   .....(1)
For calculating mass of MgO:
The chemical equation for the formation of magnesium oxide follows:
Let 'x' grams of magnesium is reacting to form magnesium oxide.
Molar mass of Magnesium = 24.3 g/mol
Putting values in equation 1, we get:
Number of moles of magnesium =
By Stoichiometry of the reaction:
2 moles of magnesium produces 2 moles of MgO
So, moles of magnesium will produce moles of MgO
Molar mass of MgO = 40.3 g/mol
Putting values in equation 1, we get:
Mass of MgO =
Mass of magnesium oxide = = X grams
For calculating mass of
:
The chemical equation for the formation of magnesium nitride follows:
Mass of magnesium reacting = (3.26 - x)
Molar mass of Magnesium = 24.3 g/mol
Putting values in equation 1, we get:
Number of moles of magnesium =
By Stoichiometry of the reaction:
3 moles of magnesium produces 1 moles of
So, moles of magnesium will produce moles of
Molar mass of = 101 g/mol
Putting values in equation 1, we get:
Mass of
Mass of magnesium nitride = = Y grams
Calculating the mass of products:
Total mass of the products = 5.09 grams
Putting values of 'X' and 'Y' in above equation, we get:
Mass of MgO =
Mass of
Hence, the mass of MgO formed is 3.502 grams and mass of formed is 1.587 grams.