Question

What is the number of zinc atoms in a piece of zinc weighing 10 g ? (Atomic mass of Zn = 65 u)

Answer 1

Number of Zinc Atoms is $9.03 \times 10^2^2$

Explanation:

• Mole concept provides a relationship between number of particles(atoms) and their mass. Thus it is possible to calculate the number of particles in a given mass.

• Molar mass of Zinc(Zn) = 65g

• Given Mass of the Zinc = 10g

• As we know that, Number of moles = mass of an $\frac {element}{molar\ mass\ of\ an\ element}$

Hence Number of moles= $\frac {10g}{65g}$= 0.15 moles.

Since 1 mol of zinc contains $6.02 \times 10^2^3$ atoms

Therefore, 0.15 mol of zinc contains =$6.02 \times 10^2^3 \times 0.15 mol = 9.03 \times 10^2^2$ atoms of zinc

Answer 2

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