Posted by Smarth on Tuesday, September 27, 2011 at 6:40pm.
M means some metal, such as Mg, Cr, Al. Note the metal is +3 valence.
well, in the compound, it has 27.765grams, of which the metal is (27.765-2.809) grams, and the Br is 2.809 grams.
Now, this you have 2.809grams Br, so you have 2.809/AtomicwtBr moles of Br.
But in the formula, you have 1/3 this number of moles, or
molesM=1/3*2.809/atomicwtBr
Now the easy part.
massM=molesM/atomicmassM
solve for the atomicmassM
and you can ID the Metal on the periodic table. Remember it is group +3, or +13, or a multivalent metal that can have a +3 valence.
"well, in the compound, it has 27.765grams, of which the metal is (27.765-2.809) grams, and the Br is 2.809 grams. " i dont understand this as you said br is 2.809 but the question says the unknown element is 2.809 grams?
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