w=m(nacl)/m(nacl)+m(h2o)
m(nacl)2 р-р=0.25*80=20 г
(10+20)/(80+10+x)=0.15
x=m(h2o)=110г
v(h2o)m(h2o)/p(h2o)=110г/1г/мл=110мл
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w=m(nacl)/m(nacl)+m(h2o)
m(nacl)2 р-р=0.25*80=20 г
(10+20)/(80+10+x)=0.15
x=m(h2o)=110г
v(h2o)m(h2o)/p(h2o)=110г/1г/мл=110мл