The most abundant isotopes of iron. Fe are: 56Fe (91.754%), with an atomic mass

Question

The most abundant isotopes of iron. Fe are: 56Fe (91.754%), with an atomic mass of 55.934 amu 54Fe (5.845%), with an atomic mass of 53.939 amu 57Fe (2.119%), with an atomic mass of 56.935 amu 58Fe (0.282%), with an atomic mass of 57.933 amu Which one is the average atomic mass of one Fe atom?: (a) ~55.85 amu, (b) ~57.6 amu, (c) ~53.84 amu. or (d) ~58.96 amu Ans: How many atoms are there in one gram of Fe? (a) ~ 10 20 atoms, (b) 10 21 atoms, (c) 10 22 atoms, or (d) 10 25 atoms Ans: What is the mass in grams of one atom of Fe?: (a) ~10-25 g/atom. (b)~10-28 g/atom, (c) -10-22 g/atom. or (d) ~10-26 g/atom Ans:

Explanation / Answer

a) sigma(mass*%)/100=55.85 amu c)6.022*10^23 /55.84= 10^22 c)masss of one atom=10^(-22)

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