Помогите пожалуйста
б) Расчетная часть.
Дано:
т р-ра (HNO3) = 60 г; o (HNO3) = 10 %
тр-ра (NaOH) = 70 г; o (NaOH) = 5 %
n(HNO3)​?????
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