What is the mass of an iron atom?

univerkov | July 11, 2021 | education

Given:
N (Fe) = 1
NA = 6.02 * 10 ^ 23 mol − 1

To find:
m (Fe) -?

Decision:
1) Using the periodic system of D.I.Mendeleev, determine the molar mass of iron:
M (Fe) = Mr (Fe) = Ar (Fe) = 56 g / mol;
2) Calculate the amount of iron substance:
n (Fe) = N (Fe) / NA = 1 / 6.02 * 10 ^ 23 = 1.661 * 10 ^ -24 mol;
3) Calculate the mass of iron:
m (Fe) = n (Fe) * M (Fe) = 1.661 * 10 ^ -24 * 56 = 9.301 * 10 ^ -23 g = 9.301 * 10 ^ -26 kg.

Answer: The mass of Fe is 9.301 * 10 ^ -26 kg.

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