Aluminum Alloy
Posted October 2, 2008
By admin
What is the mass percentage of aluminum in the alloy?
A 46.1 g sample of the alloy is reacted with excess hydrogen chloride. Only the Al in the alloy reacts with the HCl producing 4.84 g of hydrogen gas by the following reaction.
2Al + 6HCl ® 2AlCl3 + 3H2
Molecular mass H2 = 2.0158 g/mol
4.84 g / 2.0158 = 2.40 moles H2 formed
2 moles Al : 3 moles H2 = x : 2.40
x = 1.60 moles Al
1 mole Al weights 26.98 g
26.98 x 1.60 = 43.1 g Al
43.1 : 46.1 = x : 100
x = 93.7 %
Gallium/Aluminum alloy generating Hydrogen
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