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Estudo dos gasesFísico-Química

Qual é o número de moléculas existentes em 5,6 L de…

(Química 1, Ricardo Feltre) Qual é o número de moléculas existentes em 5,6 L de um gás qualquer, medido nas condições normais de pressão e temperatura?

Resolução

Sabemos que 1 mol de qualquer gás nas CNTP ocupa 22,4 L . Além disso, sabemos, pela constante de Avogadro (NA), que em 1 mol de determinada espécie há 6,02 × 1023 unidades de tal espécie. Assim, temos:

Portanto, em 5,6 L de qualquer gás nas CNTP há 1,505 × 1023 moléculas.

Confira mais EXERCÍCIOS RESOLVIDOS sobre ESTUDO DOS GASES.

Veja também: FÍSICO-QUÍMICA

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