Homework Help: chemistry

Posted by lynn on Sunday, November 6, 2011 at 4:46pm.

Duralin is an alloy of aluminium containing
4.5% manganese, 3.5% copper, and 0.45%
magnesium. How much magnesium is present
in a 90 g sample of this alloy?
Answer in units of mol

chemistry - bobpursley, Sunday, November 6, 2011 at 4:52pm
What is .0045*90? then because that is in grams, divide that by the atomic mass of Mg.

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