m(раст.) = m(H2O) + m(Na2CO3) = 200г+100г = 300г
w = m(соль)/m(раст)*100% = 100г/200г*100% = 50%
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m(раст.) = m(H2O) + m(Na2CO3) = 200г+100г = 300г
w = m(соль)/m(раст)*100% = 100г/200г*100% = 50%