M(NaOH)=40г/моль
m(NaOH)=3*40=120г
m(розчину)=120+480=600г
w=120*100/600=20%
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M(NaOH)=40г/моль
m(NaOH)=3*40=120г
m(розчину)=120+480=600г
w=120*100/600=20%