# Solve problem: Calculate the number of an atom of the following (Given: Atomic mass of I = 127 u). 254 g of iodine (I) - Chemistry

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Solve problem:

Calculate the number of an atom of the following (Given: Atomic mass of I = 127 u).

254 g of iodine (I)

#### Solution

254 g of iodine (I)
Atomic mass of iodine = 127 u
∴ Molar mass of iodine = 127 g mol–1
Now,
Number of moles = "Mass of a substance"/"Molar mass of a substance"
= (254  "g")/(127  "g"  "mol"^-1)
= 2 mol
Now,
Number of atoms = Number of moles × Avogadro's constant
= 2 mol × 6.022 × 1023 atoms/mol
= 12.044 × 1023 atoms
= 1.2044 × 1024 atoms
Number of iodine atoms in 254 g= 1.2044 × 1024 atoms

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#### APPEARS IN

Balbharati Chemistry 11th Standard Maharashtra State Board
Chapter 1 Some Basic Concepts of Chemistry
Exercises | Q 4. (D)(b) | Page 11