So you have approx 0.018 mols Br2. That means twice that for mols XBr so 0.036.
Since mol = g/molar mass then molar mass = g/mol = 5.20/0.036 = approx 144. Subtract atomic mass Br from that to find the atomic mass of X and identify from the periodic table. I would look in the 3d element series.
Consider this reaction involving an unknown element X. F2+2XBr = Br2+2XF When 5.200 g of XBr reacts, 2.896 g of Br2 is produced.
Calculate the molar mass of XBr in g/mols?
What is the element symbol for X?
I know that I need to convert grams of Br2 to moles and I have done that. I just don't know how to continue on to the next step.
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