2.7692 x 10²³ molecules of N₂ molecules are in the balloon.
What are moles?
A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Molar mass N₂ = 14 x 2 = 28.0 g/mol
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
12.88 ÷ 28.0
=> 0.46 moles of N₂
Number molecules N₂ :
1 mole ----------------- 6.02 x 10²³ molecules
0.46 moles------------? ( molecules )
Molecules = ( 0.46 ) x ( 6.02 x 10²³ ) ÷ 1
= 2.7692 x 10²³ molecules of N₂
Hence, 2.7692 x 10²³ molecules of N₂ molecules are in the balloon.
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