Question

Calculate the number of atom of K element in 122.5g of KClO3

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Answer 1

6.022×10²³ atoms of K

Step-by-step explanation:

Given data:

Mass of KClO₃ = 122.5 g

Number of atoms of K = ?

Solution:

First of all we will calculate the number of moles of KClO₃ .

Number of moles = mass/molar mass

Number of moles = 122.5 g/ 122.5 g/mol

Number of moles = 1 mol

One mole of KClO₃ have 1 mole of K atoms.

Number of atoms of K:

1 mole = 6.022×10²³ atoms of K

Thus in 122.5 g of KClO₃ 6.022×10²³ atoms of K are present.