1)Дано: N(в-ва)=1.806*10^24; Найти: m(в-ва)-?,M(в-ва)-?. 2)Дано: n(O2)= 3моль в н.у. ; Найти: m(O2)-?; V(O2)-?. Помогите пожалуйста. Спасибо
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