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Determinati masa de soda caustica (NaOH) in care se afla 12,044*10²³ ioni Na⁺.

Răspuns :

1mol NaOH = 40g in care exista 6,023*10²³ (Na⁺OHˉ)......6,023*10²³ Na⁺
                         x g NaOH................................................ 12,044*10²³ ioni Na⁺.
x=80 g