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Ответ

Ответ дан
Миномина

Ответ:

mв-ва NaOH=50г

Объяснение:

Дано:

mр-ра NaOH=250г

W NaOH=20%

mв-ва?

Решение:

из формулы w=mв-ва/mр-ра * 100 выводим,что mв-ва=mр-ра*w/100

mв-ва NaOH=250*20/100=50г

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