Question

Atomic mass of nitrogen is 14. How many atoms are there in 14 g of Nitrogen?​

Answer 1

14 g of nitrogen will have $6.022 X 10^{23} atoms$.

Given:

Atomic mass of nitrogen$=14$

Mass of nitrogen$=14$g

To Find:

Number of atoms in 14g nitrogen

Solution:

• One mole of a material weighs one molar mass.
• Atomic mass is the weight of a substance's single unit.

We know that, atomic mass of nitrogen$=14$

and given mass is$=14$g

So, no. of moles of nitrogen in 14g= $\frac{mass of nitrogen}{molar mass} =\frac{14}{14} =1 mole$

• The number of particles (atoms, ions, or molecules) contained in one mole of a substance is known as the Avogadro Number or Avogadro constant.
• The Avogadro constant is expressed as $mol^{-1}$.
• It has  $6.022 X 10^{23} atoms/molecules/ions.$.

We know that, 1 mole nitrogen= $6.022 X 10^{23} atoms$

Hence, 14 g nitrogen has $6.022 X 10^{23} atoms$ .

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