Asked by fatima
what is the mass of bromine contains the same number of atoms of 50.0 g of iodine?
my work:
50g/79.5g= .628 mol(Br)
50g/126g=.394 mol(I)
my work:
50g/79.5g= .628 mol(Br)
50g/126g=.394 mol(I)
Answers
Answered by
DrBob222
Note Br is 79.9 and I is 126.9
molar mass Br2 is 79.9 x 2 = 159.8
molar mass I2 is 126.9 x 2 = 253.8
In 50 g I2 there are
50/253.9 = 0.197 mols I2 or 2*0.197 = 0.394 mols I atoms (which is what you have above but I've gone about it a different way).
Now you have 0.197 mols Br2 and the mass of that will be 0.197 x 15.8 = ? grams Br2 (not Br) because Br is diatomic and occurs as Br2.
molar mass Br2 is 79.9 x 2 = 159.8
molar mass I2 is 126.9 x 2 = 253.8
In 50 g I2 there are
50/253.9 = 0.197 mols I2 or 2*0.197 = 0.394 mols I atoms (which is what you have above but I've gone about it a different way).
Now you have 0.197 mols Br2 and the mass of that will be 0.197 x 15.8 = ? grams Br2 (not Br) because Br is diatomic and occurs as Br2.
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