Massa molara
La massa molara d'una substància es la massa d'un mòl d'aquela substància. Vist que lo nombre d'Avogadro es lo nombre de particulas en un gas, la massa molara se pòt calcular a partir de la massa d'una particula de la substància e en la multiplicant pel nombre d'Avogadro, o en dividint plan la massa m de la substància pel nombre de mòls n. La massa molara d'un compausat se pòt trobar en somant las massas molaras de sos compausants.
Per exemple, en sabent que las massas molaras de l'idrogèn, lo sofre e l'oxigèn son 1 g/mol, 32 g/mol e 16 g/mol, respectivament, la massa molara de l'acid sulfuric H2SO4 serà:
M = 2·1 g/mol + 1·32 g/mol + 4·16 g/mol = 98 g/mol
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