Given that the abundances of isotopes 54^ Fe,%56^ Fe and
57^Fe are 5%, 90% and 5% respectively, the atomic mass of
Fe is:
(IIT 2009)
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Answer:Molar mass of Fe from the given isotopes is 55.95 g.
Explanation:
Step 1 : Given the abundance and the percentage fraction of the isotopes the formula for getting the atomic mass is :
Atomic mass = Sum of (atomic mass × mole fraction)
Step 2 : Substitute the values in the formula above to get the molar mass.
We have :
(54 × 5/100) + (56 × 90/100) + (57 × 5/100) = 2.7 + 50.4 + 2.85
= 55.95
Molar mass of Fe is 55.95 grams per mole.
Explanation:
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