W = (m( NaCl) / m (NaCl + H2O) )* 100%
m (NaCl + H2O) = 200 + 50 = 250 г
W = (50/250) * 100 % = 20%
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W = (m( NaCl) / m (NaCl + H2O) )* 100%
m (NaCl + H2O) = 200 + 50 = 250 г
W = (50/250) * 100 % = 20%