Question

Calculate the Number of atoms in 2.3g of Sodium

Answer 1

Answer:

One mole atoms of Na weigh 23 grams.(one mole means Avogadro's no. of atoms which has a value of 6.022*10²³.

2.3 Kg means 2300 grams of Na.

Since 23 grams consist of one mole atoms, 2300 grams will consist of 100 moles( unitary method).

Therefore, the atoms of Na in 2.3 kg of it would be 100 moles, that is, 6.022*10^25

Answer 2

The number of atoms in 2.3 g of Sodium will be

$6.023 \times {10}^{22}$

Given,

2.3 g of Sodium.

To find,

The number of atoms that are present in 2.3g of Sodium.

Solution,

We know, that the atomic mass of sodium=23g

It means that 1 mole of Na has a 23 g mass.

The number of atoms in 1 mole of Na,

$6.023 \times {10}^{23}$

If 23 g of sodium has this much number of atoms,

Then the number of moles in 2.3g of Na =

$6.023 \times {10}^{13} \times \frac{2.3}{23}$

So, the number of atoms in 2.3g of sodium is

$6.023 \times {10}^{22}$

Hence, the answer.

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