Respostas

2013-09-27T17:11:50-03:00
Gás Nitrogênio = N2 = 28g/mol

1 mol --------------------------------------- 22,4 Litros
x mols ---------------------------------------5 Litros

x = 5 / 22,4 = 0,22 mols de N2


Numero de Avogadro =~ 6 * 10^23 moléculas

1 mol ----------------------- 6 * 10^23
0,22 mols ---------------------x

x = 0,22 * 6 * 10^23

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x = 1,32 * 10^23 moléculas de N2 // aproximadamente
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1 5 1