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Transcript 
Special Challenge Problem #1
When aluminum is heated with an element from Group 6A
of the periodic table an ionic compound is formed. When
an experiment is performed with an unknownı element of
group 6A, the product is 18.56% aluminum by mass.
Determine the identity of the reacting element and the
formula of the compound.
1. Hint #2
Set up a ratio to determine the total molar
mass of the compound compared to the
total mass of aluminum, using the molar
masses.
3. 54/MM = 18.56/100%
4. MM = 291
2.
64
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