Aballoon contains 12.88 g of nnitrogene gas (n2). how many nitrogene molecules are in the balloon?

Molar mass N₂ = 14 x 2 = 28.0 g/mol

number of moles: 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

hope this helps!

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