create a proportion to find out how much one mole weighs
.347moles = 39.00g
1 mole = ?
now just cross multiply and solve whatever you get for the weight you can match it to one on the periodic table with that molar mass since the mass listed on the periodic table is the mass of one mole of an element in grams.
you should get around 112.392g and i think
A sample containing .347 moles of an element has a mass of 39.00 g. What is the element?
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