The atomic mass of bromine is 79.904 u. If a chemist finds that the mass of a sample of bromine gas, Br2, is 79.904 g,- ?
-how many moles of Br2 are present?
A 0.50000 mol B 1.0000 mol C 1.5000 mol D 79.904 mol
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A, 0.5 mol. Since the formula for finding moles is mass divided by molar mass, we first find the molar mass by doing 79.904u x 2 as Br2 has 2 molecules. we get 159.808. We then do 79.904g/159.808 to get 0.5 mol
A 0.50000 mol