How many grams of aluminum burned if 200.0 grams of aluminum oxide formed?
2 Answers
approximately 106 grams
Explanation:
The molecular mass of Aluminum Oxide is approximately 102 grams per mole.
There are two atoms of Aluminum in one mole and each atom has a mass of approximately 27 grams so
Mass of Al =
Explanation:
Balanced equation
There are three steps required to answer this question.
-
Determine moles of
#"Al"_2"O"_3"# by dividing the given mass by its molar mass#("101.960 g/mol")# . I prefer to do this by multiplying by the reciprocal of the molar mass (mol/g). -
Determine moles of
#"Al"# by multiplying moles#"Al"_2"O"_3"# by the mole ratio between#"Al"# and#"Al"_2"O"_3"# from the balanced equation, with#"Al"# in the numerator. -
Determine mass of
#"Al"# by multiplying moles#"Al"# by its molar mass#("26.982g/mol")# .
We can combine all steps into one equation: