8класс какая масса воды содержится в 400 мл 20 % раствора карбоната калия.плотность=1.19 г/см(кубический)

массовая доля рассчитывается по формуле:  

w= (m р.в / m р-ра ) *100 {%}, где

m р.в = 12г щелочи

m р-ра = m р.в + m воды= 12+68=80 г

w= 12/80= 0,15 или 15%

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