Answer: The mass of is 4.7 grams
Explanation:
To calculate the number of moles, we use the equation:
.....(1)
For aluminium:
Given mass of aluminium= 2.5 g
Molar mass of aluminium = 27 g/mol
Putting values in equation 1, we get:
For oxygen gas:
Given mass of oxygen gass = 2.5 g
Molar mass of oxygen gas = 32 g/mol
Putting values in equation 1, we get:
The chemical equation for the reaction of aluminium and oxygen gas follows:
By Stoichiometry of the reaction:
4 moles of aluminium react with = 3 moles of oxygen
So, 0.092 moles of aluminium react with = of oxygen
As, given amount of oxygen is more than the required amount. So, it is considered as an excess reagent.
Thus, aluminium is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
4 moles of aluminium produces 2 moles of aluminium oxide
So, 0.092 moles aluminium produce = of aluminium oxide
Now, calculating the mass of aluminium oxide
Hence, the mass of is 4.7 grams